using System;

using System.Security.Cryptography;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(HashString("1239016412.144100", "22930"));

    }

​

    public static string HashString(string StringToHash, string HachKey)

    {

        System.Text.UTF8Encoding myEncoder = new System.Text.UTF8Encoding();

        byte[] Key = myEncoder.GetBytes(HachKey);

        byte[] Text = myEncoder.GetBytes(StringToHash);

        HMACSHA1 myHMACSHA1 = new HMACSHA1(Key);

        byte[] HashCode = myHMACSHA1.ComputeHash(Text);

        string hash = BitConverter.ToString(HashCode).Replace("-", "");

        return hash.ToLower();

    }

}