The type is defined in an assembly that is not referenced, how to find the cause?
问题 I know the error message is common and there are plenty of questions on SO about this error, but no solutions have helped me so far, so I decided to ask the question. Difference to most of similar questions is me using App_Code directory. Error message: CS0012: The type \'Project.Rights.OperationsProvider\' is defined in an assembly that is not referenced. You must add a reference to assembly \'Project.Rights, version=1.0.0.0, Culture=neutral, PublicKeyToken=null\'. Source File: c:\\inetpub\