using System;

using System.Text;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(CalculateHash(new[] {"Hello", "World" }));

    }

    public static string CalculateHash(string[] inputs)

    {

        var hashInput = String.Join(",", inputs);

​

        using (var md5 = System.Security.Cryptography.MD5.Create())

        {

            byte[] inputBytes = System.Text.Encoding.UTF8.GetBytes(hashInput);

            byte[] hashBytes = md5.ComputeHash(inputBytes);

            var sb = new StringBuilder();

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

            {

                sb.Append(hashBytes[i].ToString("x2"));

            }

            return sb.ToString();

        }

    }

}