using System;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        string source = "Test";

        if (!int.TryParse(source, out int sourceValue) || !Enum.IsDefined(typeof(source), sourceValue))

        {

            Console.WriteLine($"Unable to parse value into a PartySource {source}.");

        }

        else {

            Console.WriteLine($"success: {(source)sourceValue}");

        }

        return;

    }

    public enum source {

        DocusignCLM = 1,

        Salesforce = 2,

        ERP = 3

    }

    public static bool TryParse<T>(string value, out T result)

    {

        bool ok = false;

​

        try

        {

            result = (T)Enum.Parse(typeof(T), value, true);

            if (typeof(T).GetCustomAttributes(typeof(FlagsAttribute), false).Any())

                ok = true; // no checking if invalid flags are set

            else

                ok = Enum.IsDefined(typeof(T), result);

        }

        catch

        {

            result = default(T);

        }

​

        return ok;

    }

};