Created by: hpaknia
To fix issue: https://github.com/OpenAPITools/openapi-generator/issues/4231
Ran following commands to regenerate C# files:
mvn clean isntall \
&& ./bin/csharp-dotnet2-petstore.sh \
&& ./bin/csharp-netcore-petstore-netcore.sh \
&& ./bin/csharp-petstore-all.sh \
&& ./bin/csharp-petstore-net-40.sh \
&& ./bin/csharp-petstore-netcore-project.sh \
&& ./bin/csharp-property-changed-petstore.sh \
&& ./bin/csharp-netcore-petstore-all.sh \
&& ./bin/csharp-netcore-petstore.sh \
&& ./bin/csharp-petstore-net-35.sh \
&& ./bin/csharp-petstore-net-standard.sh \
&& ./bin/csharp-petstore.sh