using System;

using System.Text;

using System.Security.Cryptography;

public class Program

{

    public static void Main()

    {

        string input = "SalesInvoice";

        Console.WriteLine(ToMD5Hash(input));

    }

    public static Guid ToMD5Hash(string value) {

            var valueToHash = value.ToLower();

            using (MD5 md5Hash = MD5.Create()) {

                byte[] data = md5Hash.ComputeHash(Encoding.UTF8.GetBytes(valueToHash));

                return new Guid(data);

        }

   }    

}