How to get next (or previous) enum value in C#

Question

I have an enum which is defined like this:

public enum eRat { A = 0, B=3, C=5, D=8 };

So given value eRat.B, I want to get the

Answer 1

Thanks you all, for your inspiration and solutions.

Here are my results, as an extension.

public static class Enums
{
    public static T Next(this T v) where T : struct
    {
        return Enum.GetValues(v.GetType()).Cast().Concat(new[] { default(T) }).SkipWhile(e => !v.Equals(e)).Skip(1).First();
    }

    public static T Previous(this T v) where T : struct
    {
        return Enum.GetValues(v.GetType()).Cast().Concat(new[] { default(T) }).Reverse().SkipWhile(e => !v.Equals(e)).Skip(1).First();
    }
}

use:

public enum Test { F1, F2, F3 }

public class Program
{
    public static void Main()
    {
        Test t = Test.F3;   

        Console.WriteLine(t);
        Console.WriteLine(t.Next());
        Console.WriteLine(t.Previous());

        Console.WriteLine("\n");

        t = Test.F1;    
        Console.WriteLine(t);
        Console.WriteLine(t.Next());
        Console.WriteLine(t.Previous());
    }
}

result:

F3
F1
F2

F1
F2
F3