Описание тега notimplementedexception
NotImplementedException is a .Net exception used as a placeholder in order to alert programmers to the fact that a method has not been implemented.
The NotImplementedException is a built-in exception implemented as part of the .net System namespace.
It is thrown when a method has not been implemented, alerting the caller that the method is not available and should not be used.
As part of the visual-studio template code for auto-implementing interface methods, a NotImplementedException will be inserted into the body of the auto-implemented method.
The MSDN Documentation has more information regarding the use of this exception.