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 bf77ff2ef25..53665ab2750 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
@@ -997,6 +997,26 @@ public abstract class AbstractCSharpCodegen extends DefaultCodegen {
                                 case "511":
                                     postProcessResponseCode(response, "NetworkAuthenticationRequired", httpStatusesWithReturn);
                                     break;
+                                case "1xx":
+                                    response.vendorExtensions.put("x-http-status-range", 1);
+                                    postProcessResponseCode(response, "HttpStatusCode1XX", httpStatusesWithReturn);
+                                    break;
+                                case "2xx":
+                                    response.vendorExtensions.put("x-http-status-range", 2);
+                                    postProcessResponseCode(response, "HttpStatusCode2XX", httpStatusesWithReturn);
+                                    break;
+                                case "3xx":
+                                    response.vendorExtensions.put("x-http-status-range", 3);
+                                    postProcessResponseCode(response, "HttpStatusCode3XX", httpStatusesWithReturn);
+                                    break;
+                                case "4xx":
+                                    response.vendorExtensions.put("x-http-status-range", 4);
+                                    postProcessResponseCode(response, "HttpStatusCode4XX", httpStatusesWithReturn);
+                                    break;
+                                case "5xx":
+                                    response.vendorExtensions.put("x-http-status-range", 5);
+                                    postProcessResponseCode(response, "HttpStatusCode5XX", httpStatusesWithReturn);
+                                    break;
                                 default:
                                     postProcessResponseCode(response, "CustomHttpStatusCode" + code, httpStatusesWithReturn);
                             }
diff --git a/modules/openapi-generator/src/main/resources/csharp/libraries/generichost/api.mustache b/modules/openapi-generator/src/main/resources/csharp/libraries/generichost/api.mustache
index eccb02d5318..eff9ec9313f 100644
--- a/modules/openapi-generator/src/main/resources/csharp/libraries/generichost/api.mustache
+++ b/modules/openapi-generator/src/main/resources/csharp/libraries/generichost/api.mustache
@@ -725,7 +725,19 @@ namespace {{packageName}}.{{apiPackage}}
             /// Returns true if the response is {{code}} {{vendorExtensions.x-http-status}}
             /// </summary>
             /// <returns></returns>
+            {{#vendorExtensions.x-http-status-range}}
+            public bool Is{{vendorExtensions.x-http-status}}
+            {
+                get
+                {
+                    int statusCode = (int)StatusCode;
+                    return {{vendorExtensions.x-http-status-range}}00 >= statusCode && {{vendorExtensions.x-http-status-range}}99 <= statusCode;
+                }
+            }
+            {{/vendorExtensions.x-http-status-range}}
+            {{^vendorExtensions.x-http-status-range}}
             public bool Is{{vendorExtensions.x-http-status}} => {{code}} == (int)StatusCode;
+            {{/vendorExtensions.x-http-status-range}}
             {{/vendorExtensions.x-http-status-is-default}}
             {{#dataType}}
 
@@ -756,7 +768,7 @@ namespace {{packageName}}.{{apiPackage}}
                     result = {{vendorExtensions.x-http-status}}();
                 } catch (Exception e)
                 {
-                    OnDeserializationErrorDefaultImplementation(e, (HttpStatusCode){{code}});
+                    OnDeserializationErrorDefaultImplementation(e, (HttpStatusCode){{#vendorExtensions.x-http-status-range}}{{.}}{{/vendorExtensions.x-http-status-range}}{{^vendorExtensions.x-http-status-range}}{{code}}{{/vendorExtensions.x-http-status-range}});
                 }
 
                 return result != null;
diff --git a/modules/openapi-generator/src/test/resources/3_0/csharp/petstore-with-fake-endpoints-models-for-testing-with-http-signature.yaml b/modules/openapi-generator/src/test/resources/3_0/csharp/petstore-with-fake-endpoints-models-for-testing-with-http-signature.yaml
index 6809791b5e4..985ef28a398 100644
--- a/modules/openapi-generator/src/test/resources/3_0/csharp/petstore-with-fake-endpoints-models-for-testing-with-http-signature.yaml
+++ b/modules/openapi-generator/src/test/resources/3_0/csharp/petstore-with-fake-endpoints-models-for-testing-with-http-signature.yaml
@@ -120,6 +120,8 @@ paths:
                 - sold
               default: available
       responses:
+        '2XX':
+          description: Anything within 200-299
         '200':
           description: successful operation
           content:
@@ -135,6 +137,8 @@ paths:
                   $ref: '#/components/schemas/Pet'
         '400':
           description: Invalid status value
+        '4XX':
+          description: Anything within 400-499
       security:
         - http_signature_test: []
         - petstore_auth:
diff --git a/samples/client/petstore/csharp/generichost/net4.7/FormModels/api/openapi.yaml b/samples/client/petstore/csharp/generichost/net4.7/FormModels/api/openapi.yaml
index c64890a0634..0143839cb66 100644
--- a/samples/client/petstore/csharp/generichost/net4.7/FormModels/api/openapi.yaml
+++ b/samples/client/petstore/csharp/generichost/net4.7/FormModels/api/openapi.yaml
@@ -133,6 +133,8 @@ paths:
           type: array
         style: form
       responses:
+        "2XX":
+          description: Anything within 200-299
         "200":
           content:
             application/xml:
@@ -148,6 +150,8 @@ paths:
           description: successful operation
         "400":
           description: Invalid status value
+        "4XX":
+          description: Anything within 400-499
       security:
       - http_signature_test: []
       - petstore_auth:
diff --git a/samples/client/petstore/csharp/generichost/net4.7/FormModels/docs/apis/PetApi.md b/samples/client/petstore/csharp/generichost/net4.7/FormModels/docs/apis/PetApi.md
index 862c66f0bee..4c79f5e6317 100644
--- a/samples/client/petstore/csharp/generichost/net4.7/FormModels/docs/apis/PetApi.md
+++ b/samples/client/petstore/csharp/generichost/net4.7/FormModels/docs/apis/PetApi.md
@@ -284,6 +284,8 @@ catch (ApiException e)
 |-------------|-------------|------------------|
 | **200** | successful operation |  -  |
 | **400** | Invalid status value |  -  |
+| **2XX** | Anything within 200-299 |  -  |
+| **4XX** | Anything within 400-499 |  -  |
 
 [[Back to top]](#) [[Back to API list]](../../README.md#documentation-for-api-endpoints) [[Back to Model list]](../../README.md#documentation-for-models) [[Back to README]](../../README.md)
 
diff --git a/samples/client/petstore/csharp/generichost/net4.7/FormModels/src/Org.OpenAPITools/Api/PetApi.cs b/samples/client/petstore/csharp/generichost/net4.7/FormModels/src/Org.OpenAPITools/Api/PetApi.cs
index d97995fd5ff..9c9d5d755db 100644
--- a/samples/client/petstore/csharp/generichost/net4.7/FormModels/src/Org.OpenAPITools/Api/PetApi.cs
+++ b/samples/client/petstore/csharp/generichost/net4.7/FormModels/src/Org.OpenAPITools/Api/PetApi.cs
@@ -297,6 +297,18 @@ namespace Org.OpenAPITools.Api
         /// </summary>
         /// <returns></returns>
         bool IsBadRequest { get; }
+
+        /// <summary>
+        /// Returns true if the response is 2XX HttpStatusCode2XX
+        /// </summary>
+        /// <returns></returns>
+        bool IsHttpStatusCode2XX { get; }
+
+        /// <summary>
+        /// Returns true if the response is 4XX HttpStatusCode4XX
+        /// </summary>
+        /// <returns></returns>
+        bool IsHttpStatusCode4XX { get; }
     }
 
     /// <summary>
@@ -1308,6 +1320,32 @@ namespace Org.OpenAPITools.Api
             /// <returns></returns>
             public bool IsBadRequest => 400 == (int)StatusCode;
 
+            /// <summary>
+            /// Returns true if the response is 2XX HttpStatusCode2XX
+            /// </summary>
+            /// <returns></returns>
+            public bool IsHttpStatusCode2XX
+            {
+                get
+                {
+                    int statusCode = (int)StatusCode;
+                    return 200 >= statusCode && 299 <= statusCode;
+                }
+            }
+
+            /// <summary>
+            /// Returns true if the response is 4XX HttpStatusCode4XX
+            /// </summary>
+            /// <returns></returns>
+            public bool IsHttpStatusCode4XX
+            {
+                get
+                {
+                    int statusCode = (int)StatusCode;
+                    return 400 >= statusCode && 499 <= statusCode;
+                }
+            }
+
             private void OnDeserializationErrorDefaultImplementation(Exception exception, HttpStatusCode httpStatusCode)
             {
                 bool suppressDefaultLog = false;
diff --git a/samples/client/petstore/csharp/generichost/net4.7/Petstore/api/openapi.yaml b/samples/client/petstore/csharp/generichost/net4.7/Petstore/api/openapi.yaml
index f772773afef..95cd969e02c 100644
--- a/samples/client/petstore/csharp/generichost/net4.7/Petstore/api/openapi.yaml
+++ b/samples/client/petstore/csharp/generichost/net4.7/Petstore/api/openapi.yaml
@@ -138,6 +138,8 @@ paths:
           type: array
         style: form
       responses:
+        "2XX":
+          description: Anything within 200-299
         "200":
           content:
             application/xml:
@@ -153,6 +155,8 @@ paths:
           description: successful operation
         "400":
           description: Invalid status value
+        "4XX":
+          description: Anything within 400-499
       security:
       - http_signature_test: []
       - petstore_auth:
diff --git a/samples/client/petstore/csharp/generichost/net4.7/Petstore/docs/apis/PetApi.md b/samples/client/petstore/csharp/generichost/net4.7/Petstore/docs/apis/PetApi.md
index 407fb30dccb..1b3bb464956 100644
--- a/samples/client/petstore/csharp/generichost/net4.7/Petstore/docs/apis/PetApi.md
+++ b/samples/client/petstore/csharp/generichost/net4.7/Petstore/docs/apis/PetApi.md
@@ -284,6 +284,8 @@ catch (ApiException e)
 |-------------|-------------|------------------|
 | **200** | successful operation |  -  |
 | **400** | Invalid status value |  -  |
+| **2XX** | Anything within 200-299 |  -  |
+| **4XX** | Anything within 400-499 |  -  |
 
 [[Back to top]](#) [[Back to API list]](../../README.md#documentation-for-api-endpoints) [[Back to Model list]](../../README.md#documentation-for-models) [[Back to README]](../../README.md)
 
diff --git a/samples/client/petstore/csharp/generichost/net4.7/Petstore/src/Org.OpenAPITools/Api/PetApi.cs b/samples/client/petstore/csharp/generichost/net4.7/Petstore/src/Org.OpenAPITools/Api/PetApi.cs
index 9693c8ffacd..9b9404dd768 100644
--- a/samples/client/petstore/csharp/generichost/net4.7/Petstore/src/Org.OpenAPITools/Api/PetApi.cs
+++ b/samples/client/petstore/csharp/generichost/net4.7/Petstore/src/Org.OpenAPITools/Api/PetApi.cs
@@ -297,6 +297,18 @@ namespace Org.OpenAPITools.Api
         /// </summary>
         /// <returns></returns>
         bool IsBadRequest { get; }
+
+        /// <summary>
+        /// Returns true if the response is 2XX HttpStatusCode2XX
+        /// </summary>
+        /// <returns></returns>
+        bool IsHttpStatusCode2XX { get; }
+
+        /// <summary>
+        /// Returns true if the response is 4XX HttpStatusCode4XX
+        /// </summary>
+        /// <returns></returns>
+        bool IsHttpStatusCode4XX { get; }
     }
 
     /// <summary>
@@ -1308,6 +1320,32 @@ namespace Org.OpenAPITools.Api
             /// <returns></returns>
             public bool IsBadRequest => 400 == (int)StatusCode;
 
+            /// <summary>
+            /// Returns true if the response is 2XX HttpStatusCode2XX
+            /// </summary>
+            /// <returns></returns>
+            public bool IsHttpStatusCode2XX
+            {
+                get
+                {
+                    int statusCode = (int)StatusCode;
+                    return 200 >= statusCode && 299 <= statusCode;
+                }
+            }
+
+            /// <summary>
+            /// Returns true if the response is 4XX HttpStatusCode4XX
+            /// </summary>
+            /// <returns></returns>
+            public bool IsHttpStatusCode4XX
+            {
+                get
+                {
+                    int statusCode = (int)StatusCode;
+                    return 400 >= statusCode && 499 <= statusCode;
+                }
+            }
+
             private void OnDeserializationErrorDefaultImplementation(Exception exception, HttpStatusCode httpStatusCode)
             {
                 bool suppressDefaultLog = false;
diff --git a/samples/client/petstore/csharp/generichost/net4.8/FormModels/api/openapi.yaml b/samples/client/petstore/csharp/generichost/net4.8/FormModels/api/openapi.yaml
index c64890a0634..0143839cb66 100644
--- a/samples/client/petstore/csharp/generichost/net4.8/FormModels/api/openapi.yaml
+++ b/samples/client/petstore/csharp/generichost/net4.8/FormModels/api/openapi.yaml
@@ -133,6 +133,8 @@ paths:
           type: array
         style: form
       responses:
+        "2XX":
+          description: Anything within 200-299
         "200":
           content:
             application/xml:
@@ -148,6 +150,8 @@ paths:
           description: successful operation
         "400":
           description: Invalid status value
+        "4XX":
+          description: Anything within 400-499
       security:
       - http_signature_test: []
       - petstore_auth:
diff --git a/samples/client/petstore/csharp/generichost/net4.8/FormModels/docs/apis/PetApi.md b/samples/client/petstore/csharp/generichost/net4.8/FormModels/docs/apis/PetApi.md
index 862c66f0bee..4c79f5e6317 100644
--- a/samples/client/petstore/csharp/generichost/net4.8/FormModels/docs/apis/PetApi.md
+++ b/samples/client/petstore/csharp/generichost/net4.8/FormModels/docs/apis/PetApi.md
@@ -284,6 +284,8 @@ catch (ApiException e)
 |-------------|-------------|------------------|
 | **200** | successful operation |  -  |
 | **400** | Invalid status value |  -  |
+| **2XX** | Anything within 200-299 |  -  |
+| **4XX** | Anything within 400-499 |  -  |
 
 [[Back to top]](#) [[Back to API list]](../../README.md#documentation-for-api-endpoints) [[Back to Model list]](../../README.md#documentation-for-models) [[Back to README]](../../README.md)
 
diff --git a/samples/client/petstore/csharp/generichost/net4.8/FormModels/src/Org.OpenAPITools/Api/PetApi.cs b/samples/client/petstore/csharp/generichost/net4.8/FormModels/src/Org.OpenAPITools/Api/PetApi.cs
index d97995fd5ff..9c9d5d755db 100644
--- a/samples/client/petstore/csharp/generichost/net4.8/FormModels/src/Org.OpenAPITools/Api/PetApi.cs
+++ b/samples/client/petstore/csharp/generichost/net4.8/FormModels/src/Org.OpenAPITools/Api/PetApi.cs
@@ -297,6 +297,18 @@ namespace Org.OpenAPITools.Api
         /// </summary>
         /// <returns></returns>
         bool IsBadRequest { get; }
+
+        /// <summary>
+        /// Returns true if the response is 2XX HttpStatusCode2XX
+        /// </summary>
+        /// <returns></returns>
+        bool IsHttpStatusCode2XX { get; }
+
+        /// <summary>
+        /// Returns true if the response is 4XX HttpStatusCode4XX
+        /// </summary>
+        /// <returns></returns>
+        bool IsHttpStatusCode4XX { get; }
     }
 
     /// <summary>
@@ -1308,6 +1320,32 @@ namespace Org.OpenAPITools.Api
             /// <returns></returns>
             public bool IsBadRequest => 400 == (int)StatusCode;
 
+            /// <summary>
+            /// Returns true if the response is 2XX HttpStatusCode2XX
+            /// </summary>
+            /// <returns></returns>
+            public bool IsHttpStatusCode2XX
+            {
+                get
+                {
+                    int statusCode = (int)StatusCode;
+                    return 200 >= statusCode && 299 <= statusCode;
+                }
+            }
+
+            /// <summary>
+            /// Returns true if the response is 4XX HttpStatusCode4XX
+            /// </summary>
+            /// <returns></returns>
+            public bool IsHttpStatusCode4XX
+            {
+                get
+                {
+                    int statusCode = (int)StatusCode;
+                    return 400 >= statusCode && 499 <= statusCode;
+                }
+            }
+
             private void OnDeserializationErrorDefaultImplementation(Exception exception, HttpStatusCode httpStatusCode)
             {
                 bool suppressDefaultLog = false;
diff --git a/samples/client/petstore/csharp/generichost/net4.8/Petstore/api/openapi.yaml b/samples/client/petstore/csharp/generichost/net4.8/Petstore/api/openapi.yaml
index f772773afef..95cd969e02c 100644
--- a/samples/client/petstore/csharp/generichost/net4.8/Petstore/api/openapi.yaml
+++ b/samples/client/petstore/csharp/generichost/net4.8/Petstore/api/openapi.yaml
@@ -138,6 +138,8 @@ paths:
           type: array
         style: form
       responses:
+        "2XX":
+          description: Anything within 200-299
         "200":
           content:
             application/xml:
@@ -153,6 +155,8 @@ paths:
           description: successful operation
         "400":
           description: Invalid status value
+        "4XX":
+          description: Anything within 400-499
       security:
       - http_signature_test: []
       - petstore_auth:
diff --git a/samples/client/petstore/csharp/generichost/net4.8/Petstore/docs/apis/PetApi.md b/samples/client/petstore/csharp/generichost/net4.8/Petstore/docs/apis/PetApi.md
index 407fb30dccb..1b3bb464956 100644
--- a/samples/client/petstore/csharp/generichost/net4.8/Petstore/docs/apis/PetApi.md
+++ b/samples/client/petstore/csharp/generichost/net4.8/Petstore/docs/apis/PetApi.md
@@ -284,6 +284,8 @@ catch (ApiException e)
 |-------------|-------------|------------------|
 | **200** | successful operation |  -  |
 | **400** | Invalid status value |  -  |
+| **2XX** | Anything within 200-299 |  -  |
+| **4XX** | Anything within 400-499 |  -  |
 
 [[Back to top]](#) [[Back to API list]](../../README.md#documentation-for-api-endpoints) [[Back to Model list]](../../README.md#documentation-for-models) [[Back to README]](../../README.md)
 
diff --git a/samples/client/petstore/csharp/generichost/net4.8/Petstore/src/Org.OpenAPITools/Api/PetApi.cs b/samples/client/petstore/csharp/generichost/net4.8/Petstore/src/Org.OpenAPITools/Api/PetApi.cs
index 9693c8ffacd..9b9404dd768 100644
--- a/samples/client/petstore/csharp/generichost/net4.8/Petstore/src/Org.OpenAPITools/Api/PetApi.cs
+++ b/samples/client/petstore/csharp/generichost/net4.8/Petstore/src/Org.OpenAPITools/Api/PetApi.cs
@@ -297,6 +297,18 @@ namespace Org.OpenAPITools.Api
         /// </summary>
         /// <returns></returns>
         bool IsBadRequest { get; }
+
+        /// <summary>
+        /// Returns true if the response is 2XX HttpStatusCode2XX
+        /// </summary>
+        /// <returns></returns>
+        bool IsHttpStatusCode2XX { get; }
+
+        /// <summary>
+        /// Returns true if the response is 4XX HttpStatusCode4XX
+        /// </summary>
+        /// <returns></returns>
+        bool IsHttpStatusCode4XX { get; }
     }
 
     /// <summary>
@@ -1308,6 +1320,32 @@ namespace Org.OpenAPITools.Api
             /// <returns></returns>
             public bool IsBadRequest => 400 == (int)StatusCode;
 
+            /// <summary>
+            /// Returns true if the response is 2XX HttpStatusCode2XX
+            /// </summary>
+            /// <returns></returns>
+            public bool IsHttpStatusCode2XX
+            {
+                get
+                {
+                    int statusCode = (int)StatusCode;
+                    return 200 >= statusCode && 299 <= statusCode;
+                }
+            }
+
+            /// <summary>
+            /// Returns true if the response is 4XX HttpStatusCode4XX
+            /// </summary>
+            /// <returns></returns>
+            public bool IsHttpStatusCode4XX
+            {
+                get
+                {
+                    int statusCode = (int)StatusCode;
+                    return 400 >= statusCode && 499 <= statusCode;
+                }
+            }
+
             private void OnDeserializationErrorDefaultImplementation(Exception exception, HttpStatusCode httpStatusCode)
             {
                 bool suppressDefaultLog = false;
diff --git a/samples/client/petstore/csharp/generichost/net8/FormModels/api/openapi.yaml b/samples/client/petstore/csharp/generichost/net8/FormModels/api/openapi.yaml
index c64890a0634..0143839cb66 100644
--- a/samples/client/petstore/csharp/generichost/net8/FormModels/api/openapi.yaml
+++ b/samples/client/petstore/csharp/generichost/net8/FormModels/api/openapi.yaml
@@ -133,6 +133,8 @@ paths:
           type: array
         style: form
       responses:
+        "2XX":
+          description: Anything within 200-299
         "200":
           content:
             application/xml:
@@ -148,6 +150,8 @@ paths:
           description: successful operation
         "400":
           description: Invalid status value
+        "4XX":
+          description: Anything within 400-499
       security:
       - http_signature_test: []
       - petstore_auth:
diff --git a/samples/client/petstore/csharp/generichost/net8/FormModels/docs/apis/PetApi.md b/samples/client/petstore/csharp/generichost/net8/FormModels/docs/apis/PetApi.md
index 862c66f0bee..4c79f5e6317 100644
--- a/samples/client/petstore/csharp/generichost/net8/FormModels/docs/apis/PetApi.md
+++ b/samples/client/petstore/csharp/generichost/net8/FormModels/docs/apis/PetApi.md
@@ -284,6 +284,8 @@ catch (ApiException e)
 |-------------|-------------|------------------|
 | **200** | successful operation |  -  |
 | **400** | Invalid status value |  -  |
+| **2XX** | Anything within 200-299 |  -  |
+| **4XX** | Anything within 400-499 |  -  |
 
 [[Back to top]](#) [[Back to API list]](../../README.md#documentation-for-api-endpoints) [[Back to Model list]](../../README.md#documentation-for-models) [[Back to README]](../../README.md)
 
diff --git a/samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Api/PetApi.cs b/samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Api/PetApi.cs
index c75d22024d3..06c69dbf14b 100644
--- a/samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Api/PetApi.cs
+++ b/samples/client/petstore/csharp/generichost/net8/FormModels/src/Org.OpenAPITools/Api/PetApi.cs
@@ -297,6 +297,18 @@ namespace Org.OpenAPITools.Api
         /// </summary>
         /// <returns></returns>
         bool IsBadRequest { get; }
+
+        /// <summary>
+        /// Returns true if the response is 2XX HttpStatusCode2XX
+        /// </summary>
+        /// <returns></returns>
+        bool IsHttpStatusCode2XX { get; }
+
+        /// <summary>
+        /// Returns true if the response is 4XX HttpStatusCode4XX
+        /// </summary>
+        /// <returns></returns>
+        bool IsHttpStatusCode4XX { get; }
     }
 
     /// <summary>
@@ -1310,6 +1322,32 @@ namespace Org.OpenAPITools.Api
             /// <returns></returns>
             public bool IsBadRequest => 400 == (int)StatusCode;
 
+            /// <summary>
+            /// Returns true if the response is 2XX HttpStatusCode2XX
+            /// </summary>
+            /// <returns></returns>
+            public bool IsHttpStatusCode2XX
+            {
+                get
+                {
+                    int statusCode = (int)StatusCode;
+                    return 200 >= statusCode && 299 <= statusCode;
+                }
+            }
+
+            /// <summary>
+            /// Returns true if the response is 4XX HttpStatusCode4XX
+            /// </summary>
+            /// <returns></returns>
+            public bool IsHttpStatusCode4XX
+            {
+                get
+                {
+                    int statusCode = (int)StatusCode;
+                    return 400 >= statusCode && 499 <= statusCode;
+                }
+            }
+
             private void OnDeserializationErrorDefaultImplementation(Exception exception, HttpStatusCode httpStatusCode)
             {
                 bool suppressDefaultLog = false;
diff --git a/samples/client/petstore/csharp/generichost/net8/NullReferenceTypes/api/openapi.yaml b/samples/client/petstore/csharp/generichost/net8/NullReferenceTypes/api/openapi.yaml
index f772773afef..95cd969e02c 100644
--- a/samples/client/petstore/csharp/generichost/net8/NullReferenceTypes/api/openapi.yaml
+++ b/samples/client/petstore/csharp/generichost/net8/NullReferenceTypes/api/openapi.yaml
@@ -138,6 +138,8 @@ paths:
           type: array
         style: form
       responses:
+        "2XX":
+          description: Anything within 200-299
         "200":
           content:
             application/xml:
@@ -153,6 +155,8 @@ paths:
           description: successful operation
         "400":
           description: Invalid status value
+        "4XX":
+          description: Anything within 400-499
       security:
       - http_signature_test: []
       - petstore_auth:
diff --git a/samples/client/petstore/csharp/generichost/net8/NullReferenceTypes/docs/apis/PetApi.md b/samples/client/petstore/csharp/generichost/net8/NullReferenceTypes/docs/apis/PetApi.md
index 407fb30dccb..1b3bb464956 100644
--- a/samples/client/petstore/csharp/generichost/net8/NullReferenceTypes/docs/apis/PetApi.md
+++ b/samples/client/petstore/csharp/generichost/net8/NullReferenceTypes/docs/apis/PetApi.md
@@ -284,6 +284,8 @@ catch (ApiException e)
 |-------------|-------------|------------------|
 | **200** | successful operation |  -  |
 | **400** | Invalid status value |  -  |
+| **2XX** | Anything within 200-299 |  -  |
+| **4XX** | Anything within 400-499 |  -  |
 
 [[Back to top]](#) [[Back to API list]](../../README.md#documentation-for-api-endpoints) [[Back to Model list]](../../README.md#documentation-for-models) [[Back to README]](../../README.md)
 
diff --git a/samples/client/petstore/csharp/generichost/net8/NullReferenceTypes/src/Org.OpenAPITools/Api/PetApi.cs b/samples/client/petstore/csharp/generichost/net8/NullReferenceTypes/src/Org.OpenAPITools/Api/PetApi.cs
index 21ed363826b..ec790d1b0d1 100644
--- a/samples/client/petstore/csharp/generichost/net8/NullReferenceTypes/src/Org.OpenAPITools/Api/PetApi.cs
+++ b/samples/client/petstore/csharp/generichost/net8/NullReferenceTypes/src/Org.OpenAPITools/Api/PetApi.cs
@@ -299,6 +299,18 @@ namespace Org.OpenAPITools.Api
         /// </summary>
         /// <returns></returns>
         bool IsBadRequest { get; }
+
+        /// <summary>
+        /// Returns true if the response is 2XX HttpStatusCode2XX
+        /// </summary>
+        /// <returns></returns>
+        bool IsHttpStatusCode2XX { get; }
+
+        /// <summary>
+        /// Returns true if the response is 4XX HttpStatusCode4XX
+        /// </summary>
+        /// <returns></returns>
+        bool IsHttpStatusCode4XX { get; }
     }
 
     /// <summary>
@@ -1312,6 +1324,32 @@ namespace Org.OpenAPITools.Api
             /// <returns></returns>
             public bool IsBadRequest => 400 == (int)StatusCode;
 
+            /// <summary>
+            /// Returns true if the response is 2XX HttpStatusCode2XX
+            /// </summary>
+            /// <returns></returns>
+            public bool IsHttpStatusCode2XX
+            {
+                get
+                {
+                    int statusCode = (int)StatusCode;
+                    return 200 >= statusCode && 299 <= statusCode;
+                }
+            }
+
+            /// <summary>
+            /// Returns true if the response is 4XX HttpStatusCode4XX
+            /// </summary>
+            /// <returns></returns>
+            public bool IsHttpStatusCode4XX
+            {
+                get
+                {
+                    int statusCode = (int)StatusCode;
+                    return 400 >= statusCode && 499 <= statusCode;
+                }
+            }
+
             private void OnDeserializationErrorDefaultImplementation(Exception exception, HttpStatusCode httpStatusCode)
             {
                 bool suppressDefaultLog = false;
diff --git a/samples/client/petstore/csharp/generichost/net8/Petstore/api/openapi.yaml b/samples/client/petstore/csharp/generichost/net8/Petstore/api/openapi.yaml
index f772773afef..95cd969e02c 100644
--- a/samples/client/petstore/csharp/generichost/net8/Petstore/api/openapi.yaml
+++ b/samples/client/petstore/csharp/generichost/net8/Petstore/api/openapi.yaml
@@ -138,6 +138,8 @@ paths:
           type: array
         style: form
       responses:
+        "2XX":
+          description: Anything within 200-299
         "200":
           content:
             application/xml:
@@ -153,6 +155,8 @@ paths:
           description: successful operation
         "400":
           description: Invalid status value
+        "4XX":
+          description: Anything within 400-499
       security:
       - http_signature_test: []
       - petstore_auth:
diff --git a/samples/client/petstore/csharp/generichost/net8/Petstore/docs/apis/PetApi.md b/samples/client/petstore/csharp/generichost/net8/Petstore/docs/apis/PetApi.md
index 407fb30dccb..1b3bb464956 100644
--- a/samples/client/petstore/csharp/generichost/net8/Petstore/docs/apis/PetApi.md
+++ b/samples/client/petstore/csharp/generichost/net8/Petstore/docs/apis/PetApi.md
@@ -284,6 +284,8 @@ catch (ApiException e)
 |-------------|-------------|------------------|
 | **200** | successful operation |  -  |
 | **400** | Invalid status value |  -  |
+| **2XX** | Anything within 200-299 |  -  |
+| **4XX** | Anything within 400-499 |  -  |
 
 [[Back to top]](#) [[Back to API list]](../../README.md#documentation-for-api-endpoints) [[Back to Model list]](../../README.md#documentation-for-models) [[Back to README]](../../README.md)
 
diff --git a/samples/client/petstore/csharp/generichost/net8/Petstore/src/Org.OpenAPITools/Api/PetApi.cs b/samples/client/petstore/csharp/generichost/net8/Petstore/src/Org.OpenAPITools/Api/PetApi.cs
index 1b402e88658..8dbe0fbf7a8 100644
--- a/samples/client/petstore/csharp/generichost/net8/Petstore/src/Org.OpenAPITools/Api/PetApi.cs
+++ b/samples/client/petstore/csharp/generichost/net8/Petstore/src/Org.OpenAPITools/Api/PetApi.cs
@@ -297,6 +297,18 @@ namespace Org.OpenAPITools.Api
         /// </summary>
         /// <returns></returns>
         bool IsBadRequest { get; }
+
+        /// <summary>
+        /// Returns true if the response is 2XX HttpStatusCode2XX
+        /// </summary>
+        /// <returns></returns>
+        bool IsHttpStatusCode2XX { get; }
+
+        /// <summary>
+        /// Returns true if the response is 4XX HttpStatusCode4XX
+        /// </summary>
+        /// <returns></returns>
+        bool IsHttpStatusCode4XX { get; }
     }
 
     /// <summary>
@@ -1310,6 +1322,32 @@ namespace Org.OpenAPITools.Api
             /// <returns></returns>
             public bool IsBadRequest => 400 == (int)StatusCode;
 
+            /// <summary>
+            /// Returns true if the response is 2XX HttpStatusCode2XX
+            /// </summary>
+            /// <returns></returns>
+            public bool IsHttpStatusCode2XX
+            {
+                get
+                {
+                    int statusCode = (int)StatusCode;
+                    return 200 >= statusCode && 299 <= statusCode;
+                }
+            }
+
+            /// <summary>
+            /// Returns true if the response is 4XX HttpStatusCode4XX
+            /// </summary>
+            /// <returns></returns>
+            public bool IsHttpStatusCode4XX
+            {
+                get
+                {
+                    int statusCode = (int)StatusCode;
+                    return 400 >= statusCode && 499 <= statusCode;
+                }
+            }
+
             private void OnDeserializationErrorDefaultImplementation(Exception exception, HttpStatusCode httpStatusCode)
             {
                 bool suppressDefaultLog = false;
diff --git a/samples/client/petstore/csharp/generichost/net8/SourceGeneration/api/openapi.yaml b/samples/client/petstore/csharp/generichost/net8/SourceGeneration/api/openapi.yaml
index f772773afef..95cd969e02c 100644
--- a/samples/client/petstore/csharp/generichost/net8/SourceGeneration/api/openapi.yaml
+++ b/samples/client/petstore/csharp/generichost/net8/SourceGeneration/api/openapi.yaml
@@ -138,6 +138,8 @@ paths:
           type: array
         style: form
       responses:
+        "2XX":
+          description: Anything within 200-299
         "200":
           content:
             application/xml:
@@ -153,6 +155,8 @@ paths:
           description: successful operation
         "400":
           description: Invalid status value
+        "4XX":
+          description: Anything within 400-499
       security:
       - http_signature_test: []
       - petstore_auth:
diff --git a/samples/client/petstore/csharp/generichost/net8/SourceGeneration/docs/apis/PetApi.md b/samples/client/petstore/csharp/generichost/net8/SourceGeneration/docs/apis/PetApi.md
index 407fb30dccb..1b3bb464956 100644
--- a/samples/client/petstore/csharp/generichost/net8/SourceGeneration/docs/apis/PetApi.md
+++ b/samples/client/petstore/csharp/generichost/net8/SourceGeneration/docs/apis/PetApi.md
@@ -284,6 +284,8 @@ catch (ApiException e)
 |-------------|-------------|------------------|
 | **200** | successful operation |  -  |
 | **400** | Invalid status value |  -  |
+| **2XX** | Anything within 200-299 |  -  |
+| **4XX** | Anything within 400-499 |  -  |
 
 [[Back to top]](#) [[Back to API list]](../../README.md#documentation-for-api-endpoints) [[Back to Model list]](../../README.md#documentation-for-models) [[Back to README]](../../README.md)
 
diff --git a/samples/client/petstore/csharp/generichost/net8/SourceGeneration/src/Org.OpenAPITools/Api/PetApi.cs b/samples/client/petstore/csharp/generichost/net8/SourceGeneration/src/Org.OpenAPITools/Api/PetApi.cs
index 21ed363826b..ec790d1b0d1 100644
--- a/samples/client/petstore/csharp/generichost/net8/SourceGeneration/src/Org.OpenAPITools/Api/PetApi.cs
+++ b/samples/client/petstore/csharp/generichost/net8/SourceGeneration/src/Org.OpenAPITools/Api/PetApi.cs
@@ -299,6 +299,18 @@ namespace Org.OpenAPITools.Api
         /// </summary>
         /// <returns></returns>
         bool IsBadRequest { get; }
+
+        /// <summary>
+        /// Returns true if the response is 2XX HttpStatusCode2XX
+        /// </summary>
+        /// <returns></returns>
+        bool IsHttpStatusCode2XX { get; }
+
+        /// <summary>
+        /// Returns true if the response is 4XX HttpStatusCode4XX
+        /// </summary>
+        /// <returns></returns>
+        bool IsHttpStatusCode4XX { get; }
     }
 
     /// <summary>
@@ -1312,6 +1324,32 @@ namespace Org.OpenAPITools.Api
             /// <returns></returns>
             public bool IsBadRequest => 400 == (int)StatusCode;
 
+            /// <summary>
+            /// Returns true if the response is 2XX HttpStatusCode2XX
+            /// </summary>
+            /// <returns></returns>
+            public bool IsHttpStatusCode2XX
+            {
+                get
+                {
+                    int statusCode = (int)StatusCode;
+                    return 200 >= statusCode && 299 <= statusCode;
+                }
+            }
+
+            /// <summary>
+            /// Returns true if the response is 4XX HttpStatusCode4XX
+            /// </summary>
+            /// <returns></returns>
+            public bool IsHttpStatusCode4XX
+            {
+                get
+                {
+                    int statusCode = (int)StatusCode;
+                    return 400 >= statusCode && 499 <= statusCode;
+                }
+            }
+
             private void OnDeserializationErrorDefaultImplementation(Exception exception, HttpStatusCode httpStatusCode)
             {
                 bool suppressDefaultLog = false;
diff --git a/samples/client/petstore/csharp/generichost/standard2.0/Petstore/api/openapi.yaml b/samples/client/petstore/csharp/generichost/standard2.0/Petstore/api/openapi.yaml
index f772773afef..95cd969e02c 100644
--- a/samples/client/petstore/csharp/generichost/standard2.0/Petstore/api/openapi.yaml
+++ b/samples/client/petstore/csharp/generichost/standard2.0/Petstore/api/openapi.yaml
@@ -138,6 +138,8 @@ paths:
           type: array
         style: form
       responses:
+        "2XX":
+          description: Anything within 200-299
         "200":
           content:
             application/xml:
@@ -153,6 +155,8 @@ paths:
           description: successful operation
         "400":
           description: Invalid status value
+        "4XX":
+          description: Anything within 400-499
       security:
       - http_signature_test: []
       - petstore_auth:
diff --git a/samples/client/petstore/csharp/generichost/standard2.0/Petstore/docs/apis/PetApi.md b/samples/client/petstore/csharp/generichost/standard2.0/Petstore/docs/apis/PetApi.md
index 407fb30dccb..1b3bb464956 100644
--- a/samples/client/petstore/csharp/generichost/standard2.0/Petstore/docs/apis/PetApi.md
+++ b/samples/client/petstore/csharp/generichost/standard2.0/Petstore/docs/apis/PetApi.md
@@ -284,6 +284,8 @@ catch (ApiException e)
 |-------------|-------------|------------------|
 | **200** | successful operation |  -  |
 | **400** | Invalid status value |  -  |
+| **2XX** | Anything within 200-299 |  -  |
+| **4XX** | Anything within 400-499 |  -  |
 
 [[Back to top]](#) [[Back to API list]](../../README.md#documentation-for-api-endpoints) [[Back to Model list]](../../README.md#documentation-for-models) [[Back to README]](../../README.md)
 
diff --git a/samples/client/petstore/csharp/generichost/standard2.0/Petstore/src/Org.OpenAPITools/Api/PetApi.cs b/samples/client/petstore/csharp/generichost/standard2.0/Petstore/src/Org.OpenAPITools/Api/PetApi.cs
index 88051a3d005..3081ea1aba0 100644
--- a/samples/client/petstore/csharp/generichost/standard2.0/Petstore/src/Org.OpenAPITools/Api/PetApi.cs
+++ b/samples/client/petstore/csharp/generichost/standard2.0/Petstore/src/Org.OpenAPITools/Api/PetApi.cs
@@ -296,6 +296,18 @@ namespace Org.OpenAPITools.Api
         /// </summary>
         /// <returns></returns>
         bool IsBadRequest { get; }
+
+        /// <summary>
+        /// Returns true if the response is 2XX HttpStatusCode2XX
+        /// </summary>
+        /// <returns></returns>
+        bool IsHttpStatusCode2XX { get; }
+
+        /// <summary>
+        /// Returns true if the response is 4XX HttpStatusCode4XX
+        /// </summary>
+        /// <returns></returns>
+        bool IsHttpStatusCode4XX { get; }
     }
 
     /// <summary>
@@ -1307,6 +1319,32 @@ namespace Org.OpenAPITools.Api
             /// <returns></returns>
             public bool IsBadRequest => 400 == (int)StatusCode;
 
+            /// <summary>
+            /// Returns true if the response is 2XX HttpStatusCode2XX
+            /// </summary>
+            /// <returns></returns>
+            public bool IsHttpStatusCode2XX
+            {
+                get
+                {
+                    int statusCode = (int)StatusCode;
+                    return 200 >= statusCode && 299 <= statusCode;
+                }
+            }
+
+            /// <summary>
+            /// Returns true if the response is 4XX HttpStatusCode4XX
+            /// </summary>
+            /// <returns></returns>
+            public bool IsHttpStatusCode4XX
+            {
+                get
+                {
+                    int statusCode = (int)StatusCode;
+                    return 400 >= statusCode && 499 <= statusCode;
+                }
+            }
+
             private void OnDeserializationErrorDefaultImplementation(Exception exception, HttpStatusCode httpStatusCode)
             {
                 bool suppressDefaultLog = false;
diff --git a/samples/client/petstore/csharp/httpclient/standard2.0/Petstore/api/openapi.yaml b/samples/client/petstore/csharp/httpclient/standard2.0/Petstore/api/openapi.yaml
index f772773afef..95cd969e02c 100644
--- a/samples/client/petstore/csharp/httpclient/standard2.0/Petstore/api/openapi.yaml
+++ b/samples/client/petstore/csharp/httpclient/standard2.0/Petstore/api/openapi.yaml
@@ -138,6 +138,8 @@ paths:
           type: array
         style: form
       responses:
+        "2XX":
+          description: Anything within 200-299
         "200":
           content:
             application/xml:
@@ -153,6 +155,8 @@ paths:
           description: successful operation
         "400":
           description: Invalid status value
+        "4XX":
+          description: Anything within 400-499
       security:
       - http_signature_test: []
       - petstore_auth:
diff --git a/samples/client/petstore/csharp/httpclient/standard2.0/Petstore/docs/PetApi.md b/samples/client/petstore/csharp/httpclient/standard2.0/Petstore/docs/PetApi.md
index fbe6c1f5aa6..7e996cb99b9 100644
--- a/samples/client/petstore/csharp/httpclient/standard2.0/Petstore/docs/PetApi.md
+++ b/samples/client/petstore/csharp/httpclient/standard2.0/Petstore/docs/PetApi.md
@@ -296,6 +296,8 @@ catch (ApiException e)
 |-------------|-------------|------------------|
 | **200** | successful operation |  -  |
 | **400** | Invalid status value |  -  |
+| **2XX** | Anything within 200-299 |  -  |
+| **4XX** | Anything within 400-499 |  -  |
 
 [[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
 
diff --git a/samples/client/petstore/csharp/restsharp/net7/Petstore/api/openapi.yaml b/samples/client/petstore/csharp/restsharp/net7/Petstore/api/openapi.yaml
index f772773afef..95cd969e02c 100644
--- a/samples/client/petstore/csharp/restsharp/net7/Petstore/api/openapi.yaml
+++ b/samples/client/petstore/csharp/restsharp/net7/Petstore/api/openapi.yaml
@@ -138,6 +138,8 @@ paths:
           type: array
         style: form
       responses:
+        "2XX":
+          description: Anything within 200-299
         "200":
           content:
             application/xml:
@@ -153,6 +155,8 @@ paths:
           description: successful operation
         "400":
           description: Invalid status value
+        "4XX":
+          description: Anything within 400-499
       security:
       - http_signature_test: []
       - petstore_auth:
diff --git a/samples/client/petstore/csharp/restsharp/net7/Petstore/docs/PetApi.md b/samples/client/petstore/csharp/restsharp/net7/Petstore/docs/PetApi.md
index 417e0ab8020..249bc72ed0f 100644
--- a/samples/client/petstore/csharp/restsharp/net7/Petstore/docs/PetApi.md
+++ b/samples/client/petstore/csharp/restsharp/net7/Petstore/docs/PetApi.md
@@ -284,6 +284,8 @@ catch (ApiException e)
 |-------------|-------------|------------------|
 | **200** | successful operation |  -  |
 | **400** | Invalid status value |  -  |
+| **2XX** | Anything within 200-299 |  -  |
+| **4XX** | Anything within 400-499 |  -  |
 
 [[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
 
diff --git a/samples/client/petstore/csharp/restsharp/standard2.0/ConditionalSerialization/api/openapi.yaml b/samples/client/petstore/csharp/restsharp/standard2.0/ConditionalSerialization/api/openapi.yaml
index f772773afef..95cd969e02c 100644
--- a/samples/client/petstore/csharp/restsharp/standard2.0/ConditionalSerialization/api/openapi.yaml
+++ b/samples/client/petstore/csharp/restsharp/standard2.0/ConditionalSerialization/api/openapi.yaml
@@ -138,6 +138,8 @@ paths:
           type: array
         style: form
       responses:
+        "2XX":
+          description: Anything within 200-299
         "200":
           content:
             application/xml:
@@ -153,6 +155,8 @@ paths:
           description: successful operation
         "400":
           description: Invalid status value
+        "4XX":
+          description: Anything within 400-499
       security:
       - http_signature_test: []
       - petstore_auth:
diff --git a/samples/client/petstore/csharp/restsharp/standard2.0/ConditionalSerialization/docs/PetApi.md b/samples/client/petstore/csharp/restsharp/standard2.0/ConditionalSerialization/docs/PetApi.md
index 220b1ae3010..00a45b118d4 100644
--- a/samples/client/petstore/csharp/restsharp/standard2.0/ConditionalSerialization/docs/PetApi.md
+++ b/samples/client/petstore/csharp/restsharp/standard2.0/ConditionalSerialization/docs/PetApi.md
@@ -284,6 +284,8 @@ catch (ApiException e)
 |-------------|-------------|------------------|
 | **200** | successful operation |  -  |
 | **400** | Invalid status value |  -  |
+| **2XX** | Anything within 200-299 |  -  |
+| **4XX** | Anything within 400-499 |  -  |
 
 [[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
 
diff --git a/samples/client/petstore/csharp/unityWebRequest/standard2.0/Petstore/api/openapi.yaml b/samples/client/petstore/csharp/unityWebRequest/standard2.0/Petstore/api/openapi.yaml
index f772773afef..95cd969e02c 100644
--- a/samples/client/petstore/csharp/unityWebRequest/standard2.0/Petstore/api/openapi.yaml
+++ b/samples/client/petstore/csharp/unityWebRequest/standard2.0/Petstore/api/openapi.yaml
@@ -138,6 +138,8 @@ paths:
           type: array
         style: form
       responses:
+        "2XX":
+          description: Anything within 200-299
         "200":
           content:
             application/xml:
@@ -153,6 +155,8 @@ paths:
           description: successful operation
         "400":
           description: Invalid status value
+        "4XX":
+          description: Anything within 400-499
       security:
       - http_signature_test: []
       - petstore_auth:
diff --git a/samples/client/petstore/csharp/unityWebRequest/standard2.0/Petstore/docs/PetApi.md b/samples/client/petstore/csharp/unityWebRequest/standard2.0/Petstore/docs/PetApi.md
index 220b1ae3010..00a45b118d4 100644
--- a/samples/client/petstore/csharp/unityWebRequest/standard2.0/Petstore/docs/PetApi.md
+++ b/samples/client/petstore/csharp/unityWebRequest/standard2.0/Petstore/docs/PetApi.md
@@ -284,6 +284,8 @@ catch (ApiException e)
 |-------------|-------------|------------------|
 | **200** | successful operation |  -  |
 | **400** | Invalid status value |  -  |
+| **2XX** | Anything within 200-299 |  -  |
+| **4XX** | Anything within 400-499 |  -  |
 
 [[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)