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Compiler Error CS0553

'conversion routine' : user defined conversion to/from base class

User-defined conversions to values of a base class are not allowed; you do not need such an operator.

The following sample generates CS0553:

C#
// CS0553.cs  
namespace x  
{  
   public class ii  
   {  
   }  
  
   public class a : ii  
   {  
      // delete the conversion routine to resolve CS0553  
      public static implicit operator ii(a aa) // CS0553  
      {  
         return new ii();  
      }  
  
      public static void Main()  
      {  
      }  
   }  
}