diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractCSharpCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractCSharpCodegen.java
index c8e08476421..a364d2cec72 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractCSharpCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractCSharpCodegen.java
@@ -765,19 +765,6 @@ public abstract class AbstractCSharpCodegen extends DefaultCodegen implements Co
                         }
                     }
 
-
-                    // check if the payload is json and set x-is-json accordingly
-                    if (operation.consumes != null) {
-                        for (Map<String, String> consume : operation.consumes) {
-                            if (consume.containsKey("mediaType")) {
-                                if (isJsonMimeType(consume.get("mediaType"))) {
-                                    operation.vendorExtensions.put("x-is-json", true);
-                                    break;
-                                }
-                            }
-                        }
-                    }
-
                     if (operation.examples != null) {
                         for (Map<String, String> example : operation.examples) {
                             for (Map.Entry<String, String> entry : example.entrySet()) {
@@ -863,8 +850,6 @@ public abstract class AbstractCSharpCodegen extends DefaultCodegen implements Co
     }
 
     private void patchParameter(CodegenParameter parameter, List<ModelMap> allModels) {
-        parameter.paramName = escapeReservedWord(parameter.paramName);
-
         patchVendorExtensionNullableValueType(parameter);
 
         if (this.getNullableReferencesTypes() || (parameter.vendorExtensions.get("x-nullable-value-type") != null)) {
@@ -1014,7 +999,7 @@ public abstract class AbstractCSharpCodegen extends DefaultCodegen implements Co
         // pet_id => petId
         name = camelize(name, LOWERCASE_FIRST_LETTER);
 
-        return name;
+        return escapeReservedWord(name);
     }
 
     public String escapeReservedWord(CodegenModel model, String name) {
diff --git a/samples/client/petstore/csharp/OpenAPIClient-ConditionalSerialization/docs/FakeApi.md b/samples/client/petstore/csharp/OpenAPIClient-ConditionalSerialization/docs/FakeApi.md
index f2bf397505d..9c646838c3d 100644
--- a/samples/client/petstore/csharp/OpenAPIClient-ConditionalSerialization/docs/FakeApi.md
+++ b/samples/client/petstore/csharp/OpenAPIClient-ConditionalSerialization/docs/FakeApi.md
@@ -844,7 +844,7 @@ namespace Example
             var int32 = 56;  // int? | None (optional) 
             var int64 = 789L;  // long? | None (optional) 
             var varFloat = 3.4F;  // float? | None (optional) 
-            var varString = "string_example";  // string | None (optional) 
+            var varString = "varString_example";  // string | None (optional) 
             var binary = new System.IO.MemoryStream(System.IO.File.ReadAllBytes("/path/to/file.txt"));  // System.IO.Stream | None (optional) 
             var date = DateTime.Parse("2013-10-20");  // DateTime? | None (optional) 
             var dateTime = DateTime.Parse(""2010-02-01T10:20:10.111110+01:00"");  // DateTime? | None (optional)  (default to "2010-02-01T10:20:10.111110+01:00")
diff --git a/samples/client/petstore/csharp/OpenAPIClient-generichost-net6.0-nrt/docs/apis/FakeApi.md b/samples/client/petstore/csharp/OpenAPIClient-generichost-net6.0-nrt/docs/apis/FakeApi.md
index 82106bd5206..c21c791fe24 100644
--- a/samples/client/petstore/csharp/OpenAPIClient-generichost-net6.0-nrt/docs/apis/FakeApi.md
+++ b/samples/client/petstore/csharp/OpenAPIClient-generichost-net6.0-nrt/docs/apis/FakeApi.md
@@ -846,7 +846,7 @@ namespace Example
             var integer = 56;  // int | None (optional) 
             var int32 = 56;  // int | None (optional) 
             var int64 = 789L;  // long | None (optional) 
-            var varString = "string_example";  // string | None (optional) 
+            var varString = "varString_example";  // string | None (optional) 
             var password = "password_example";  // string | None (optional) 
             var callback = "callback_example";  // string | None (optional) 
             var dateTime = DateTime.Parse(""2010-02-01T10:20:10.111110+01:00"");  // DateTime | None (optional)  (default to "2010-02-01T10:20:10.111110+01:00")
diff --git a/samples/client/petstore/csharp/OpenAPIClient-generichost-net6.0/docs/apis/FakeApi.md b/samples/client/petstore/csharp/OpenAPIClient-generichost-net6.0/docs/apis/FakeApi.md
index 82106bd5206..c21c791fe24 100644
--- a/samples/client/petstore/csharp/OpenAPIClient-generichost-net6.0/docs/apis/FakeApi.md
+++ b/samples/client/petstore/csharp/OpenAPIClient-generichost-net6.0/docs/apis/FakeApi.md
@@ -846,7 +846,7 @@ namespace Example
             var integer = 56;  // int | None (optional) 
             var int32 = 56;  // int | None (optional) 
             var int64 = 789L;  // long | None (optional) 
-            var varString = "string_example";  // string | None (optional) 
+            var varString = "varString_example";  // string | None (optional) 
             var password = "password_example";  // string | None (optional) 
             var callback = "callback_example";  // string | None (optional) 
             var dateTime = DateTime.Parse(""2010-02-01T10:20:10.111110+01:00"");  // DateTime | None (optional)  (default to "2010-02-01T10:20:10.111110+01:00")
diff --git a/samples/client/petstore/csharp/OpenAPIClient-generichost-netstandard2.0/docs/apis/FakeApi.md b/samples/client/petstore/csharp/OpenAPIClient-generichost-netstandard2.0/docs/apis/FakeApi.md
index 82106bd5206..c21c791fe24 100644
--- a/samples/client/petstore/csharp/OpenAPIClient-generichost-netstandard2.0/docs/apis/FakeApi.md
+++ b/samples/client/petstore/csharp/OpenAPIClient-generichost-netstandard2.0/docs/apis/FakeApi.md
@@ -846,7 +846,7 @@ namespace Example
             var integer = 56;  // int | None (optional) 
             var int32 = 56;  // int | None (optional) 
             var int64 = 789L;  // long | None (optional) 
-            var varString = "string_example";  // string | None (optional) 
+            var varString = "varString_example";  // string | None (optional) 
             var password = "password_example";  // string | None (optional) 
             var callback = "callback_example";  // string | None (optional) 
             var dateTime = DateTime.Parse(""2010-02-01T10:20:10.111110+01:00"");  // DateTime | None (optional)  (default to "2010-02-01T10:20:10.111110+01:00")
diff --git a/samples/client/petstore/csharp/OpenAPIClient-httpclient/docs/FakeApi.md b/samples/client/petstore/csharp/OpenAPIClient-httpclient/docs/FakeApi.md
index 179bd712636..af0db86acfe 100644
--- a/samples/client/petstore/csharp/OpenAPIClient-httpclient/docs/FakeApi.md
+++ b/samples/client/petstore/csharp/OpenAPIClient-httpclient/docs/FakeApi.md
@@ -884,7 +884,7 @@ namespace Example
             var int32 = 56;  // int? | None (optional) 
             var int64 = 789L;  // long? | None (optional) 
             var varFloat = 3.4F;  // float? | None (optional) 
-            var varString = "string_example";  // string | None (optional) 
+            var varString = "varString_example";  // string | None (optional) 
             var binary = new System.IO.MemoryStream(System.IO.File.ReadAllBytes("/path/to/file.txt"));  // FileParameter | None (optional) 
             var date = DateTime.Parse("2013-10-20");  // DateTime? | None (optional) 
             var dateTime = DateTime.Parse(""2010-02-01T10:20:10.111110+01:00"");  // DateTime? | None (optional)  (default to "2010-02-01T10:20:10.111110+01:00")
diff --git a/samples/client/petstore/csharp/OpenAPIClient-net47/docs/FakeApi.md b/samples/client/petstore/csharp/OpenAPIClient-net47/docs/FakeApi.md
index f2bf397505d..9c646838c3d 100644
--- a/samples/client/petstore/csharp/OpenAPIClient-net47/docs/FakeApi.md
+++ b/samples/client/petstore/csharp/OpenAPIClient-net47/docs/FakeApi.md
@@ -844,7 +844,7 @@ namespace Example
             var int32 = 56;  // int? | None (optional) 
             var int64 = 789L;  // long? | None (optional) 
             var varFloat = 3.4F;  // float? | None (optional) 
-            var varString = "string_example";  // string | None (optional) 
+            var varString = "varString_example";  // string | None (optional) 
             var binary = new System.IO.MemoryStream(System.IO.File.ReadAllBytes("/path/to/file.txt"));  // System.IO.Stream | None (optional) 
             var date = DateTime.Parse("2013-10-20");  // DateTime? | None (optional) 
             var dateTime = DateTime.Parse(""2010-02-01T10:20:10.111110+01:00"");  // DateTime? | None (optional)  (default to "2010-02-01T10:20:10.111110+01:00")
diff --git a/samples/client/petstore/csharp/OpenAPIClient-net48/docs/FakeApi.md b/samples/client/petstore/csharp/OpenAPIClient-net48/docs/FakeApi.md
index f2bf397505d..9c646838c3d 100644
--- a/samples/client/petstore/csharp/OpenAPIClient-net48/docs/FakeApi.md
+++ b/samples/client/petstore/csharp/OpenAPIClient-net48/docs/FakeApi.md
@@ -844,7 +844,7 @@ namespace Example
             var int32 = 56;  // int? | None (optional) 
             var int64 = 789L;  // long? | None (optional) 
             var varFloat = 3.4F;  // float? | None (optional) 
-            var varString = "string_example";  // string | None (optional) 
+            var varString = "varString_example";  // string | None (optional) 
             var binary = new System.IO.MemoryStream(System.IO.File.ReadAllBytes("/path/to/file.txt"));  // System.IO.Stream | None (optional) 
             var date = DateTime.Parse("2013-10-20");  // DateTime? | None (optional) 
             var dateTime = DateTime.Parse(""2010-02-01T10:20:10.111110+01:00"");  // DateTime? | None (optional)  (default to "2010-02-01T10:20:10.111110+01:00")
diff --git a/samples/client/petstore/csharp/OpenAPIClient-net5.0/docs/FakeApi.md b/samples/client/petstore/csharp/OpenAPIClient-net5.0/docs/FakeApi.md
index 575453fad06..7d94cce2029 100644
--- a/samples/client/petstore/csharp/OpenAPIClient-net5.0/docs/FakeApi.md
+++ b/samples/client/petstore/csharp/OpenAPIClient-net5.0/docs/FakeApi.md
@@ -844,7 +844,7 @@ namespace Example
             var int32 = 56;  // int? | None (optional) 
             var int64 = 789L;  // long? | None (optional) 
             var varFloat = 3.4F;  // float? | None (optional) 
-            var varString = "string_example";  // string? | None (optional) 
+            var varString = "varString_example";  // string? | None (optional) 
             var binary = new System.IO.MemoryStream(System.IO.File.ReadAllBytes("/path/to/file.txt"));  // System.IO.Stream? | None (optional) 
             var date = DateTime.Parse("2013-10-20");  // DateTime? | None (optional) 
             var dateTime = DateTime.Parse(""2010-02-01T10:20:10.111110+01:00"");  // DateTime? | None (optional)  (default to "2010-02-01T10:20:10.111110+01:00")
diff --git a/samples/client/petstore/csharp/OpenAPIClient-unityWebRequest/docs/FakeApi.md b/samples/client/petstore/csharp/OpenAPIClient-unityWebRequest/docs/FakeApi.md
index f2bf397505d..9c646838c3d 100644
--- a/samples/client/petstore/csharp/OpenAPIClient-unityWebRequest/docs/FakeApi.md
+++ b/samples/client/petstore/csharp/OpenAPIClient-unityWebRequest/docs/FakeApi.md
@@ -844,7 +844,7 @@ namespace Example
             var int32 = 56;  // int? | None (optional) 
             var int64 = 789L;  // long? | None (optional) 
             var varFloat = 3.4F;  // float? | None (optional) 
-            var varString = "string_example";  // string | None (optional) 
+            var varString = "varString_example";  // string | None (optional) 
             var binary = new System.IO.MemoryStream(System.IO.File.ReadAllBytes("/path/to/file.txt"));  // System.IO.Stream | None (optional) 
             var date = DateTime.Parse("2013-10-20");  // DateTime? | None (optional) 
             var dateTime = DateTime.Parse(""2010-02-01T10:20:10.111110+01:00"");  // DateTime? | None (optional)  (default to "2010-02-01T10:20:10.111110+01:00")
diff --git a/samples/client/petstore/csharp/OpenAPIClient/docs/FakeApi.md b/samples/client/petstore/csharp/OpenAPIClient/docs/FakeApi.md
index f2bf397505d..9c646838c3d 100644
--- a/samples/client/petstore/csharp/OpenAPIClient/docs/FakeApi.md
+++ b/samples/client/petstore/csharp/OpenAPIClient/docs/FakeApi.md
@@ -844,7 +844,7 @@ namespace Example
             var int32 = 56;  // int? | None (optional) 
             var int64 = 789L;  // long? | None (optional) 
             var varFloat = 3.4F;  // float? | None (optional) 
-            var varString = "string_example";  // string | None (optional) 
+            var varString = "varString_example";  // string | None (optional) 
             var binary = new System.IO.MemoryStream(System.IO.File.ReadAllBytes("/path/to/file.txt"));  // System.IO.Stream | None (optional) 
             var date = DateTime.Parse("2013-10-20");  // DateTime? | None (optional) 
             var dateTime = DateTime.Parse(""2010-02-01T10:20:10.111110+01:00"");  // DateTime? | None (optional)  (default to "2010-02-01T10:20:10.111110+01:00")
diff --git a/samples/client/petstore/csharp/OpenAPIClientCore/docs/FakeApi.md b/samples/client/petstore/csharp/OpenAPIClientCore/docs/FakeApi.md
index 575453fad06..7d94cce2029 100644
--- a/samples/client/petstore/csharp/OpenAPIClientCore/docs/FakeApi.md
+++ b/samples/client/petstore/csharp/OpenAPIClientCore/docs/FakeApi.md
@@ -844,7 +844,7 @@ namespace Example
             var int32 = 56;  // int? | None (optional) 
             var int64 = 789L;  // long? | None (optional) 
             var varFloat = 3.4F;  // float? | None (optional) 
-            var varString = "string_example";  // string? | None (optional) 
+            var varString = "varString_example";  // string? | None (optional) 
             var binary = new System.IO.MemoryStream(System.IO.File.ReadAllBytes("/path/to/file.txt"));  // System.IO.Stream? | None (optional) 
             var date = DateTime.Parse("2013-10-20");  // DateTime? | None (optional) 
             var dateTime = DateTime.Parse(""2010-02-01T10:20:10.111110+01:00"");  // DateTime? | None (optional)  (default to "2010-02-01T10:20:10.111110+01:00")