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Compiler Error CS0531

'member' : interface members cannot have a definition

Methods that are declared in an interface must be implemented in a class that inherits from it and not in the interface itself.

The following sample generates CS0531:

C#
// CS0531.cs  
namespace x  
{  
   public interface clx  
   {  
      int xclx()   // CS0531, cannot define xclx  
      // Try the following declaration instead:  
      // int xclx();  
      {  
         return 0;  
      }  
   }  
  
   public class cly  
   {  
      public static void Main()  
      {  
      }  
   }  
}