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;
      }
   }
}