[csharp] fix system.web warning and removed unneeded fqn (#18902)

* Refactor validatable.mustache moved fqn types to using directive for cleaner code

Fix netcore_project.mustache conditional "System.Web", more details:
https://learn.microsoft.com/en-us/aspnet/core/migration/inc/adapters?view=aspnetcore-7.0

* updated csharp samples

samples/client/petstore/csharp/generichost/net8/AllOf/src/Org.OpenAPITools/Model/Person.cs

@@ -105,7 +105,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             return this.BaseValidate(validationContext);
         }
@@ -115,7 +115,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        protected IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> BaseValidate(ValidationContext validationContext)
+        protected IEnumerable<ValidationResult> BaseValidate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/AnyOf/src/Org.OpenAPITools/Model/Apple.cs

@@ -82,7 +82,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/AnyOf/src/Org.OpenAPITools/Model/Banana.cs

@@ -82,7 +82,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/AnyOf/src/Org.OpenAPITools/Model/Fruit.cs

@@ -109,7 +109,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/AnyOfNoCompare/src/Org.OpenAPITools/Model/Apple.cs

@@ -81,7 +81,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/AnyOfNoCompare/src/Org.OpenAPITools/Model/Banana.cs

@@ -81,7 +81,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/AnyOfNoCompare/src/Org.OpenAPITools/Model/Fruit.cs

@@ -108,7 +108,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/Activity.cs

@@ -80,7 +80,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/ActivityOutputElementRepresentation.cs

@@ -96,7 +96,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/AdditionalPropertiesClass.cs

@@ -193,7 +193,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/Animal.cs

@@ -87,7 +87,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             return this.BaseValidate(validationContext);
         }
@@ -97,7 +97,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        protected IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> BaseValidate(ValidationContext validationContext)
+        protected IEnumerable<ValidationResult> BaseValidate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/ApiResponse.cs

@@ -112,7 +112,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/Apple.cs

@@ -112,7 +112,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             if (this.ColorCodeOption.Value != null) {
                 // ColorCode (string) pattern

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/AppleReq.cs

@@ -82,7 +82,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/ArrayOfArrayOfNumberOnly.cs

@@ -80,7 +80,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/ArrayOfNumberOnly.cs

@@ -80,7 +80,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/ArrayTest.cs

@@ -112,7 +112,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/Banana.cs

@@ -80,7 +80,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/BananaReq.cs

@@ -82,7 +82,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/BasquePig.cs

@@ -73,7 +73,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/Capitalization.cs

@@ -161,7 +161,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/Category.cs

@@ -89,7 +89,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/ClassModel.cs

@@ -80,7 +80,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/ComplexQuadrilateral.cs

@@ -82,7 +82,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/DanishPig.cs

@@ -73,7 +73,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/DateOnlyClass.cs

@@ -81,7 +81,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/DeprecatedObject.cs

@@ -80,7 +80,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/Drawing.cs

@@ -128,7 +128,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/EnumArrays.cs

@@ -96,7 +96,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/EnumTest.cs

@@ -201,7 +201,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/EquilateralTriangle.cs

@@ -82,7 +82,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/File.cs

@@ -81,7 +81,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/FileSchemaTestClass.cs

@@ -96,7 +96,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/Foo.cs

@@ -80,7 +80,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/FooGetDefaultResponse.cs

@@ -80,7 +80,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/FormatTest.cs

@@ -346,78 +346,78 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             // Number (decimal) maximum
             if (this.Number > (decimal)543.2)
             {
-                yield return new System.ComponentModel.DataAnnotations.ValidationResult("Invalid value for Number, must be a value less than or equal to 543.2.", new [] { "Number" });
+                yield return new ValidationResult("Invalid value for Number, must be a value less than or equal to 543.2.", new [] { "Number" });
             }
 
             // Number (decimal) minimum
             if (this.Number < (decimal)32.1)
             {
-                yield return new System.ComponentModel.DataAnnotations.ValidationResult("Invalid value for Number, must be a value greater than or equal to 32.1.", new [] { "Number" });
+                yield return new ValidationResult("Invalid value for Number, must be a value greater than or equal to 32.1.", new [] { "Number" });
             }
 
             // Password (string) maxLength
             if (this.Password != null && this.Password.Length > 64)
             {
-                yield return new System.ComponentModel.DataAnnotations.ValidationResult("Invalid value for Password, length must be less than 64.", new [] { "Password" });
+                yield return new ValidationResult("Invalid value for Password, length must be less than 64.", new [] { "Password" });
             }
 
             // Password (string) minLength
             if (this.Password != null && this.Password.Length < 10)
             {
-                yield return new System.ComponentModel.DataAnnotations.ValidationResult("Invalid value for Password, length must be greater than 10.", new [] { "Password" });
+                yield return new ValidationResult("Invalid value for Password, length must be greater than 10.", new [] { "Password" });
             }
 
             // Double (double) maximum
             if (this.DoubleOption.IsSet && this.DoubleOption.Value > (double)123.4)
             {
-                yield return new System.ComponentModel.DataAnnotations.ValidationResult("Invalid value for Double, must be a value less than or equal to 123.4.", new [] { "Double" });
+                yield return new ValidationResult("Invalid value for Double, must be a value less than or equal to 123.4.", new [] { "Double" });
             }
 
             // Double (double) minimum
             if (this.DoubleOption.IsSet && this.DoubleOption.Value < (double)67.8)
             {
-                yield return new System.ComponentModel.DataAnnotations.ValidationResult("Invalid value for Double, must be a value greater than or equal to 67.8.", new [] { "Double" });
+                yield return new ValidationResult("Invalid value for Double, must be a value greater than or equal to 67.8.", new [] { "Double" });
             }
 
             // Float (float) maximum
             if (this.FloatOption.IsSet && this.FloatOption.Value > (float)987.6)
             {
-                yield return new System.ComponentModel.DataAnnotations.ValidationResult("Invalid value for Float, must be a value less than or equal to 987.6.", new [] { "Float" });
+                yield return new ValidationResult("Invalid value for Float, must be a value less than or equal to 987.6.", new [] { "Float" });
             }
 
             // Float (float) minimum
             if (this.FloatOption.IsSet && this.FloatOption.Value < (float)54.3)
             {
-                yield return new System.ComponentModel.DataAnnotations.ValidationResult("Invalid value for Float, must be a value greater than or equal to 54.3.", new [] { "Float" });
+                yield return new ValidationResult("Invalid value for Float, must be a value greater than or equal to 54.3.", new [] { "Float" });
             }
 
             // Int32 (int) maximum
             if (this.Int32Option.IsSet && this.Int32Option.Value > (int)200)
             {
-                yield return new System.ComponentModel.DataAnnotations.ValidationResult("Invalid value for Int32, must be a value less than or equal to 200.", new [] { "Int32" });
+                yield return new ValidationResult("Invalid value for Int32, must be a value less than or equal to 200.", new [] { "Int32" });
             }
 
             // Int32 (int) minimum
             if (this.Int32Option.IsSet && this.Int32Option.Value < (int)20)
             {
-                yield return new System.ComponentModel.DataAnnotations.ValidationResult("Invalid value for Int32, must be a value greater than or equal to 20.", new [] { "Int32" });
+                yield return new ValidationResult("Invalid value for Int32, must be a value greater than or equal to 20.", new [] { "Int32" });
             }
 
             // Integer (int) maximum
             if (this.IntegerOption.IsSet && this.IntegerOption.Value > (int)100)
             {
-                yield return new System.ComponentModel.DataAnnotations.ValidationResult("Invalid value for Integer, must be a value less than or equal to 100.", new [] { "Integer" });
+                yield return new ValidationResult("Invalid value for Integer, must be a value less than or equal to 100.", new [] { "Integer" });
             }
 
             // Integer (int) minimum
             if (this.IntegerOption.IsSet && this.IntegerOption.Value < (int)10)
             {
-                yield return new System.ComponentModel.DataAnnotations.ValidationResult("Invalid value for Integer, must be a value greater than or equal to 10.", new [] { "Integer" });
+                yield return new ValidationResult("Invalid value for Integer, must be a value greater than or equal to 10.", new [] { "Integer" });
             }
 
             if (this.PatternWithBackslashOption.Value != null) {
@@ -463,13 +463,13 @@ namespace Org.OpenAPITools.Model
             // UnsignedInteger (uint) maximum
             if (this.UnsignedIntegerOption.IsSet && this.UnsignedIntegerOption.Value > (uint)200)
             {
-                yield return new System.ComponentModel.DataAnnotations.ValidationResult("Invalid value for UnsignedInteger, must be a value less than or equal to 200.", new [] { "UnsignedInteger" });
+                yield return new ValidationResult("Invalid value for UnsignedInteger, must be a value less than or equal to 200.", new [] { "UnsignedInteger" });
             }
 
             // UnsignedInteger (uint) minimum
             if (this.UnsignedIntegerOption.IsSet && this.UnsignedIntegerOption.Value < (uint)20)
             {
-                yield return new System.ComponentModel.DataAnnotations.ValidationResult("Invalid value for UnsignedInteger, must be a value greater than or equal to 20.", new [] { "UnsignedInteger" });
+                yield return new ValidationResult("Invalid value for UnsignedInteger, must be a value greater than or equal to 20.", new [] { "UnsignedInteger" });
             }
 
             yield break;

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/Fruit.cs

@@ -96,7 +96,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/FruitReq.cs

@@ -78,7 +78,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/GmFruit.cs

@@ -100,7 +100,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/GrandparentAnimal.cs

@@ -71,7 +71,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             return this.BaseValidate(validationContext);
         }
@@ -81,7 +81,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        protected IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> BaseValidate(ValidationContext validationContext)
+        protected IEnumerable<ValidationResult> BaseValidate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/HasOnlyReadOnly.cs

@@ -137,7 +137,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/HealthCheckResult.cs

@@ -80,7 +80,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/IsoscelesTriangle.cs

@@ -75,7 +75,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/List.cs

@@ -80,7 +80,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/LiteralStringClass.cs

@@ -96,7 +96,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/Mammal.cs

@@ -100,7 +100,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             return this.BaseValidate(validationContext);
         }
@@ -110,7 +110,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        protected IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> BaseValidate(ValidationContext validationContext)
+        protected IEnumerable<ValidationResult> BaseValidate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/MapTest.cs

@@ -128,7 +128,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/MixLog.cs

@@ -529,7 +529,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/MixedAnyOf.cs

@@ -80,7 +80,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/MixedAnyOfContent.cs

@@ -133,7 +133,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/MixedOneOf.cs

@@ -80,7 +80,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/MixedOneOfContent.cs

@@ -130,7 +130,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/MixedPropertiesAndAdditionalPropertiesClass.cs

@@ -128,7 +128,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             // UuidWithPattern (Guid) pattern
             Regex regexUuidWithPattern = new Regex(@"[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}", RegexOptions.CultureInvariant);

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/MixedSubId.cs

@@ -80,7 +80,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/Model200Response.cs

@@ -96,7 +96,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/ModelClient.cs

@@ -80,7 +80,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/Name.cs

@@ -162,7 +162,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/NotificationtestGetElementsV1ResponseMPayload.cs

@@ -82,7 +82,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/NullableClass.cs

@@ -256,7 +256,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/NullableGuidClass.cs

@@ -81,7 +81,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/NullableShape.cs

@@ -85,7 +85,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             return this.BaseValidate(validationContext);
         }
@@ -95,7 +95,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        protected IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> BaseValidate(ValidationContext validationContext)
+        protected IEnumerable<ValidationResult> BaseValidate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/NumberOnly.cs

@@ -80,7 +80,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/ObjectWithDeprecatedFields.cs

@@ -131,7 +131,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/OneOfString.cs

@@ -70,7 +70,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/Order.cs

@@ -161,7 +161,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/OuterComposite.cs

@@ -112,7 +112,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/Pet.cs

@@ -147,7 +147,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/Pig.cs

@@ -85,7 +85,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             return this.BaseValidate(validationContext);
         }
@@ -95,7 +95,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        protected IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> BaseValidate(ValidationContext validationContext)
+        protected IEnumerable<ValidationResult> BaseValidate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/PolymorphicProperty.cs

@@ -115,7 +115,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/Quadrilateral.cs

@@ -85,7 +85,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             return this.BaseValidate(validationContext);
         }
@@ -95,7 +95,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        protected IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> BaseValidate(ValidationContext validationContext)
+        protected IEnumerable<ValidationResult> BaseValidate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/QuadrilateralInterface.cs

@@ -73,7 +73,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/ReadOnlyFirst.cs

@@ -134,7 +134,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/RequiredClass.cs

@@ -618,7 +618,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/Return.cs

@@ -114,7 +114,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/RolesReportsHash.cs

@@ -96,7 +96,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/RolesReportsHashRole.cs

@@ -80,7 +80,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/ScaleneTriangle.cs

@@ -82,7 +82,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/Shape.cs

@@ -85,7 +85,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             return this.BaseValidate(validationContext);
         }
@@ -95,7 +95,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        protected IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> BaseValidate(ValidationContext validationContext)
+        protected IEnumerable<ValidationResult> BaseValidate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/ShapeInterface.cs

@@ -73,7 +73,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/ShapeOrNull.cs

@@ -85,7 +85,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             return this.BaseValidate(validationContext);
         }
@@ -95,7 +95,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        protected IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> BaseValidate(ValidationContext validationContext)
+        protected IEnumerable<ValidationResult> BaseValidate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/SimpleQuadrilateral.cs

@@ -82,7 +82,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/SpecialModelName.cs

@@ -96,7 +96,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/Tag.cs

@@ -96,7 +96,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/TestCollectionEndingWithWordList.cs

@@ -80,7 +80,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/TestCollectionEndingWithWordListObject.cs

@@ -80,7 +80,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/TestInlineFreeformAdditionalPropertiesRequest.cs

@@ -80,7 +80,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/Triangle.cs

@@ -100,7 +100,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             return this.BaseValidate(validationContext);
         }
@@ -110,7 +110,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        protected IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> BaseValidate(ValidationContext validationContext)
+        protected IEnumerable<ValidationResult> BaseValidate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/TriangleInterface.cs

@@ -73,7 +73,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/User.cs

@@ -261,7 +261,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/Whale.cs

@@ -105,7 +105,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/Zebra.cs

@@ -89,7 +89,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Model/ZeroBasedEnumClass.cs

@@ -80,7 +80,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/NullReferenceTypes/src/Org.OpenAPITools/Model/Activity.cs

@@ -82,7 +82,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/NullReferenceTypes/src/Org.OpenAPITools/Model/ActivityOutputElementRepresentation.cs

@@ -98,7 +98,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/NullReferenceTypes/src/Org.OpenAPITools/Model/AdditionalPropertiesClass.cs

@@ -195,7 +195,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/NullReferenceTypes/src/Org.OpenAPITools/Model/Animal.cs

@@ -89,7 +89,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             return this.BaseValidate(validationContext);
         }
@@ -99,7 +99,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        protected IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> BaseValidate(ValidationContext validationContext)
+        protected IEnumerable<ValidationResult> BaseValidate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/NullReferenceTypes/src/Org.OpenAPITools/Model/ApiResponse.cs

@@ -114,7 +114,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/NullReferenceTypes/src/Org.OpenAPITools/Model/Apple.cs

@@ -114,7 +114,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             if (this.ColorCodeOption.Value != null) {
                 // ColorCode (string) pattern

samples/client/petstore/csharp/generichost/net8/NullReferenceTypes/src/Org.OpenAPITools/Model/AppleReq.cs

@@ -84,7 +84,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }

samples/client/petstore/csharp/generichost/net8/NullReferenceTypes/src/Org.OpenAPITools/Model/ArrayOfArrayOfNumberOnly.cs

@@ -82,7 +82,7 @@ namespace Org.OpenAPITools.Model
         /// </summary>
         /// <param name="validationContext">Validation context</param>
         /// <returns>Validation Result</returns>
-        IEnumerable<System.ComponentModel.DataAnnotations.ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
+        IEnumerable<ValidationResult> IValidatableObject.Validate(ValidationContext validationContext)
         {
             yield break;
         }