using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        Foo result;

        if (Enum.TryParse("5", out result))

        {

            Console.WriteLine(Enum.IsDefined(typeof(Foo), result));

        }

​

    }

​

    public enum Foo

    {

        Bar = 1,

        Go = 2,

    }

}