Enum of long values in C#

Question

Why does this declaration,

public enum ECountry : long
{
    None,
    Canada,
    UnitedStates
}

require a cast for any of its values?

Answer 1

From MSDN:

In this example, the base-type option is used to declare an enum whose members are of the type long. Notice that even though the underlying type of the enumeration is long, the enumeration members must still be explicitly converted to type long using a cast.

// keyword_enum2.cs
// Using long enumerators
using System;
public class EnumTest
{
    enum Range :long {Max = 2147483648L, Min = 255L};
    static void Main()
    {
        long x = (long)Range.Max;
        long y = (long)Range.Min;
        Console.WriteLine("Max = {0}", x);
        Console.WriteLine("Min = {0}", y);
    }
}

Output

Max = 2147483648 Min = 255