using System;
 
public class Test
{
        public static void Main()
        {
                Uri baseUri = new Uri("http://w...content-available-to-author-only...o.com/asd.htm");
                Uri myUri = new Uri(baseUri, "catalog/shownew.htm");
                Console.WriteLine(baseUri.ToString());
                Console.WriteLine(myUri.ToString());   
        }
}