Visual Studio and CSharp source-file-specific configuration.

Tell the Visual Studio generators to set the source file tag <tagname> to a given value in the generated Visual Studio CSharp project. Ignored on other generators and languages. This property can be used to define dependencies between source files or set any other Visual Studio specific parameters.

Example usage:

         VS_CSHARP_DependentUpon <other file>
         VS_CSHARP_SubType "Form")