using System;

public class Program

{

    public static void Main()

    {

        var callbackUrl1 = new System.Uri("http://localhost:2757/index.html" +

                "?load=email" +

                "&userId=" + "12345££&^" +

                "&code=" + "myCo   de");

        var aHref = string.Format("<a href=\'{0}'>link</a>", callbackUrl1.AbsoluteUri);

​

        Console.WriteLine(aHref);

    }

}