Compiler Error CS0543

'enumeration' : the enumerator value is too large to fit in its type

A value that was assigned to an element in an enumeration is outside the range of the data type.

The following sample generates CS0543:

// CS0543.cs  
namespace x  
{  
   enum I : byte  
   {a = 255, b, c}   // CS0543  
   public class clx  
   {  
      public static int Main()  
      {  
         return 0;  
      }  
   }  
}