using System;

using System.Text;

using System.Security.Cryptography;

public class Program

{

    public static void Main()

    {

        using (SHA1Managed sha1 = new SHA1Managed())

        {

            Guid g = new Guid("81FE483B-39ED-4052-8FFC-55A710907D9B");

            var appGateId = g.ToString().ToUpper();

​

            var hash = sha1.ComputeHash(Encoding.Unicode.GetBytes(appGateId));

            var sb = new StringBuilder();

​

            foreach (byte b in hash)

            {

                sb.Append(b.ToString("x2"));

            }

​

            Console.WriteLine(sb.ToString());

        }

    }

}