Compiler Error CS0069

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An event in an interface cannot have add or remove accessors

You cannot define an event's accessor functions in an interface. For more information, see Events (C# Programming Guide) and Interfaces (C# Programming Guide).

The following sample generates CS0069:

// CS0069.cs
// compile with: /target:library

public delegate void EventHandler();

public interface a
{
   event EventHandler Click { remove {} }   // CS0069
   event EventHandler Click2;   // OK
}