Compiler error CS0111 occurs if a class contains two member declarations with the same parameter types. For more information, refer to the following links.
Compiler Error CS0111
Methods (C# Programming Guide).
If you continue to experience difficulties, I will ask you to open a formal support ticket and send us a small runnable application with reproduced this erroneous behavior. Thus I could do all my best to help you further in resolving it.
the Telerik team