using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        string username = "Your username";

string password = "Your password";

​

string svcCredentials = Convert.ToBase64String(System.Text.ASCIIEncoding.ASCII.GetBytes(username + ":" + password));

​

        Console.WriteLine(svcCredentials);

    }

}