using System;
using System.Net;

public class ContosoTextRequest : WebRequest, IWebRequestCreate
{
   public new WebRequest Create(Uri uri)
   {
      return new ContosoTextRequest();
   }
}

public class CreateDefaultExample
{
   public static void Main()
   {
      ContosoTextRequest contoso = new ContosoTextRequest();
      Uri contosoUri = new Uri("http://www.contoso.com/text");
      WebRequest.RegisterPrefix("http://www.contoso.com/text", contoso);

      WebRequest httpContoso = WebRequest.CreateDefault(contosoUri);
      Console.WriteLine("CreateDefault --> {0}", httpContoso);

      WebRequest textContoso = WebRequest.Create(contosoUri);
      Console.WriteLine("Create --> {0}", textContoso);
   }
}