using System;

using System.Text;

using System.Security.Cryptography;

​

public class Program

{

    private const string key = "h01gYBlP3Y20oLRzNLQ3iixaEBU-svY3P2iswQfiy2MnA0SMc80kgn4z-nk83Lsd";

    private const string message = "xcbghzW4aD3v9dkTK";

    private static readonly Encoding encoding = Encoding.UTF8; 

​

    public static void Main(string[] args)

    {

        var keyByte = encoding.GetBytes(key);

        using (var hmacsha256 = new HMACSHA1(keyByte))

        {

            hmacsha256.ComputeHash(encoding.GetBytes(message));

​

            Console.WriteLine("Result: {0}", ByteToString(hmacsha256.Hash));

        }

    }

    static string ByteToString(byte[] buff)

    {

        string sbinary = "";

        for (int i = 0; i < buff.Length; i++)

            sbinary += buff[i].ToString("X2"); /* hex format */

        return sbinary;

    }    

}