diff --git a/samples/server/petstore/aspnetcore-3.0/.openapi-generator/FILES b/samples/server/petstore/aspnetcore-3.0/.openapi-generator/FILES
index ac21668e628b..e04fd4c8e91c 100644
--- a/samples/server/petstore/aspnetcore-3.0/.openapi-generator/FILES
+++ b/samples/server/petstore/aspnetcore-3.0/.openapi-generator/FILES
@@ -24,6 +24,7 @@ src/Org.OpenAPITools/Models/Order.cs
 src/Org.OpenAPITools/Models/Pet.cs
 src/Org.OpenAPITools/Models/Tag.cs
 src/Org.OpenAPITools/Models/TestEnum.cs
+src/Org.OpenAPITools/Models/TestNullable.cs
 src/Org.OpenAPITools/Models/User.cs
 src/Org.OpenAPITools/OpenApi/TypeExtensions.cs
 src/Org.OpenAPITools/Program.cs
diff --git a/samples/server/petstore/aspnetcore-3.1/.openapi-generator/FILES b/samples/server/petstore/aspnetcore-3.1/.openapi-generator/FILES
index ac21668e628b..e04fd4c8e91c 100644
--- a/samples/server/petstore/aspnetcore-3.1/.openapi-generator/FILES
+++ b/samples/server/petstore/aspnetcore-3.1/.openapi-generator/FILES
@@ -24,6 +24,7 @@ src/Org.OpenAPITools/Models/Order.cs
 src/Org.OpenAPITools/Models/Pet.cs
 src/Org.OpenAPITools/Models/Tag.cs
 src/Org.OpenAPITools/Models/TestEnum.cs
+src/Org.OpenAPITools/Models/TestNullable.cs
 src/Org.OpenAPITools/Models/User.cs
 src/Org.OpenAPITools/OpenApi/TypeExtensions.cs
 src/Org.OpenAPITools/Program.cs
diff --git a/samples/server/petstore/aspnetcore-5.0/.openapi-generator/FILES b/samples/server/petstore/aspnetcore-5.0/.openapi-generator/FILES
index ac21668e628b..e04fd4c8e91c 100644
--- a/samples/server/petstore/aspnetcore-5.0/.openapi-generator/FILES
+++ b/samples/server/petstore/aspnetcore-5.0/.openapi-generator/FILES
@@ -24,6 +24,7 @@ src/Org.OpenAPITools/Models/Order.cs
 src/Org.OpenAPITools/Models/Pet.cs
 src/Org.OpenAPITools/Models/Tag.cs
 src/Org.OpenAPITools/Models/TestEnum.cs
+src/Org.OpenAPITools/Models/TestNullable.cs
 src/Org.OpenAPITools/Models/User.cs
 src/Org.OpenAPITools/OpenApi/TypeExtensions.cs
 src/Org.OpenAPITools/Program.cs
diff --git a/samples/server/petstore/aspnetcore-6.0-NewtonsoftFalse/.openapi-generator/FILES b/samples/server/petstore/aspnetcore-6.0-NewtonsoftFalse/.openapi-generator/FILES
index fe6225de0b22..5813de3b53b5 100644
--- a/samples/server/petstore/aspnetcore-6.0-NewtonsoftFalse/.openapi-generator/FILES
+++ b/samples/server/petstore/aspnetcore-6.0-NewtonsoftFalse/.openapi-generator/FILES
@@ -24,6 +24,7 @@ src/Org.OpenAPITools/Models/Order.cs
 src/Org.OpenAPITools/Models/Pet.cs
 src/Org.OpenAPITools/Models/Tag.cs
 src/Org.OpenAPITools/Models/TestEnum.cs
+src/Org.OpenAPITools/Models/TestNullable.cs
 src/Org.OpenAPITools/Models/User.cs
 src/Org.OpenAPITools/OpenApi/TypeExtensions.cs
 src/Org.OpenAPITools/Org.OpenAPITools.csproj
diff --git a/samples/server/petstore/aspnetcore-6.0-nullableReferenceTypes/.openapi-generator/FILES b/samples/server/petstore/aspnetcore-6.0-nullableReferenceTypes/.openapi-generator/FILES
index fe6225de0b22..5813de3b53b5 100644
--- a/samples/server/petstore/aspnetcore-6.0-nullableReferenceTypes/.openapi-generator/FILES
+++ b/samples/server/petstore/aspnetcore-6.0-nullableReferenceTypes/.openapi-generator/FILES
@@ -24,6 +24,7 @@ src/Org.OpenAPITools/Models/Order.cs
 src/Org.OpenAPITools/Models/Pet.cs
 src/Org.OpenAPITools/Models/Tag.cs
 src/Org.OpenAPITools/Models/TestEnum.cs
+src/Org.OpenAPITools/Models/TestNullable.cs
 src/Org.OpenAPITools/Models/User.cs
 src/Org.OpenAPITools/OpenApi/TypeExtensions.cs
 src/Org.OpenAPITools/Org.OpenAPITools.csproj
diff --git a/samples/server/petstore/aspnetcore-6.0-pocoModels/.openapi-generator/FILES b/samples/server/petstore/aspnetcore-6.0-pocoModels/.openapi-generator/FILES
index fe6225de0b22..5813de3b53b5 100644
--- a/samples/server/petstore/aspnetcore-6.0-pocoModels/.openapi-generator/FILES
+++ b/samples/server/petstore/aspnetcore-6.0-pocoModels/.openapi-generator/FILES
@@ -24,6 +24,7 @@ src/Org.OpenAPITools/Models/Order.cs
 src/Org.OpenAPITools/Models/Pet.cs
 src/Org.OpenAPITools/Models/Tag.cs
 src/Org.OpenAPITools/Models/TestEnum.cs
+src/Org.OpenAPITools/Models/TestNullable.cs
 src/Org.OpenAPITools/Models/User.cs
 src/Org.OpenAPITools/OpenApi/TypeExtensions.cs
 src/Org.OpenAPITools/Org.OpenAPITools.csproj
diff --git a/samples/server/petstore/aspnetcore-6.0-project4Models/.openapi-generator/FILES b/samples/server/petstore/aspnetcore-6.0-project4Models/.openapi-generator/FILES
index 2836933eb2c5..2f0226d29bc8 100644
--- a/samples/server/petstore/aspnetcore-6.0-project4Models/.openapi-generator/FILES
+++ b/samples/server/petstore/aspnetcore-6.0-project4Models/.openapi-generator/FILES
@@ -14,6 +14,7 @@ src/Org.OpenAPITools.Models/Org.OpenAPITools.Models.csproj
 src/Org.OpenAPITools.Models/Pet.cs
 src/Org.OpenAPITools.Models/Tag.cs
 src/Org.OpenAPITools.Models/TestEnum.cs
+src/Org.OpenAPITools.Models/TestNullable.cs
 src/Org.OpenAPITools.Models/User.cs
 src/Org.OpenAPITools/.gitignore
 src/Org.OpenAPITools/Attributes/ValidateModelStateAttribute.cs
diff --git a/samples/server/petstore/aspnetcore-6.0-useSwashBuckle/.openapi-generator/FILES b/samples/server/petstore/aspnetcore-6.0-useSwashBuckle/.openapi-generator/FILES
index 7d45629430c5..8da23f0cd090 100644
--- a/samples/server/petstore/aspnetcore-6.0-useSwashBuckle/.openapi-generator/FILES
+++ b/samples/server/petstore/aspnetcore-6.0-useSwashBuckle/.openapi-generator/FILES
@@ -21,6 +21,7 @@ src/Org.OpenAPITools/Models/Order.cs
 src/Org.OpenAPITools/Models/Pet.cs
 src/Org.OpenAPITools/Models/Tag.cs
 src/Org.OpenAPITools/Models/TestEnum.cs
+src/Org.OpenAPITools/Models/TestNullable.cs
 src/Org.OpenAPITools/Models/User.cs
 src/Org.OpenAPITools/OpenApi/TypeExtensions.cs
 src/Org.OpenAPITools/Org.OpenAPITools.csproj
diff --git a/samples/server/petstore/aspnetcore-6.0/.openapi-generator/FILES b/samples/server/petstore/aspnetcore-6.0/.openapi-generator/FILES
index fe6225de0b22..5813de3b53b5 100644
--- a/samples/server/petstore/aspnetcore-6.0/.openapi-generator/FILES
+++ b/samples/server/petstore/aspnetcore-6.0/.openapi-generator/FILES
@@ -24,6 +24,7 @@ src/Org.OpenAPITools/Models/Order.cs
 src/Org.OpenAPITools/Models/Pet.cs
 src/Org.OpenAPITools/Models/Tag.cs
 src/Org.OpenAPITools/Models/TestEnum.cs
+src/Org.OpenAPITools/Models/TestNullable.cs
 src/Org.OpenAPITools/Models/User.cs
 src/Org.OpenAPITools/OpenApi/TypeExtensions.cs
 src/Org.OpenAPITools/Org.OpenAPITools.csproj