Compiler Error CS0557

Duplicate user-defined conversion in type 'class'

Duplicate conversion routines are not allowed in a class.

The following example generates CS0557:

// CS0557.cs  
namespace x  
{  
    public class ii  
    {  
        public class iii  
        {  
        public static implicit operator int(iii aa)  
        {  
            return 0;  
        }  
  
    // CS0557, delete duplicate  
        public static explicit operator int(iii aa)  
        {  
            return 0;  
        }  
        }  
  
        public static void Main()  
        {  
        }  
    }  
}