Getting a “System.ArgumentException: Value was invalid” when trying to sign data using SHA256CryptoServiceProvider

Here is the symptom: 1.    You are using RSACryptoServiceProvider for computing SHA-2 signatures. 2.    Doing this you get unhandled exceptions of type "System.ArgumentException" in mscorlib.dll saying "Value was invalid". 3.    A typical call that failed was:byte[] signature = rsa.SignData(data, new SHA256CryptoServiceProvider()); 4.    The SHA1CryptoServiceProvider did not reproduce the