using System;

public class Program

{

    public enum myEnum

    {

        value1 = 1,

        value2 = 2,

        value4 = 4

    }

    public static void Main()

    {

        myEnum parsedEnum;

        var parseSuccess = Enum.TryParse("3", out parsedEnum);

        var definedSuccess = Enum.IsDefined(typeof(myEnum), "3");

        Console.WriteLine("parse success = "+parseSuccess.ToString()+" is defined success = "+definedSuccess.ToString());

    }

}