using System;

public class Program

{

    public static void Main()

    {

        string sendingSystem = " hrDe ";

        SendingSystem enumSS = SendingSystem.HRDE;

        Console.WriteLine($"Input: {sendingSystem}");

        Console.WriteLine($"SendingSystemEnum returns: {SendingSystemEnum(sendingSystem)}");

        Console.WriteLine($"Is {sendingSystem} equal to {enumSS}: {sendingSystem.Equals(enumSS)}");

    }

    public enum SendingSystem

    {

        BEE,

        GAM,

        HRDE,

        HRFR,

        HRIT,

        HRJP,

        HRMS,

        HRSARIY,

        HRUKIE,

        Unknown = 99

    }

    public static SendingSystem SendingSystemEnum(string sendingSystem)

    {

        var result = SendingSystem.Unknown;

        if (string.IsNullOrEmpty(sendingSystem))

            return result;

​

        switch (sendingSystem.ToLower().Trim())

        {

            case "bee":

                result = SendingSystem.BEE;

                break;

            case "gam":

                result = SendingSystem.GAM;

                break;

            case "hrde":

                result = SendingSystem.HRDE;

                break;

            case "hrfr":

                result = SendingSystem.HRFR;

                break;

            case "hrit":

                result = SendingSystem.HRIT;

                break;

            case "hrjp":

                result = SendingSystem.HRJP;

                break;

            case "hrms":

                result = SendingSystem.HRMS;

                break;

            case "hrsariy":

                result = SendingSystem.HRSARIY;

                break;

            case "hrukie":

                result = SendingSystem.HRUKIE;

                break;

        }

​

        return result;

    }

}