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​

using System;

using System.Text;

using System.Collections.Generic;

using System.Security.Cryptography;

​

public class HelloWorld

{

    public static void Main(string[] args)

    {

        StringBuilder postParams = new StringBuilder();

        Dictionary<string, string> hashParams = new Dictionary<string, string>();

        hashParams.Add("secureLogin", "pix_b1x2");

        hashParams.Add("symbol", "vs20fruitsw");

        hashParams.Add("language", "it");

        hashParams.Add("token", "503D8F8678AE55E57679EB7F6721E41C");

        hashParams.Add("currency", "EUR");

        hashParams.Add("technology", "H5");

        string hash = toMD5(string.Concat(postParams.ToString(), "Cd15@c47a_be69"));

        postParams.Append(string.Concat("&hash=", hash));

        System.Console.WriteLine(postParams.ToString());

    }

    public static string toMD5(string source) {

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

            var sourceBytes = Encoding.UTF8.GetBytes(source);

            var hashBytes = md5Hash.ComputeHash(sourceBytes);

            var hash = BitConverter.ToString(hashBytes).Replace("-", string.Empty);

            return hash;

        }

    }

}

​