When importing service interfaces from Net Express projects into Visual Studio, any program source that the service interface
relies upon must be at the root level of the target Visual Studio project - it cannot exist in subfolders within the Visual
Studio project.
Build Action Setting
Please, leave the Build Action Setting for a Service Interface set to None (the default). Setting the Build Action for a Service
interface from the default value of "None" to "Compile" will result in service interface properties not being displayed.