Compiler Error CS0533

'derived-class member' hides inherited abstract member 'base-class member'

A base class method is hidden. Check the syntax of your declaration to see if it is correct.

For more information, see base.

The following sample generates CS0533:

// CS0533.cs  
namespace x  
{  
   abstract public class a  
   {  
      abstract public void f();  
   }  
  
   abstract public class b : a  
   {  
      new abstract public void f();   // CS0533  
      // try the following lines instead  
      // override public void f()  
      // {  
      // }  
  
      public static void Main()  
      {  
      }  
   }  
}