not display page name in browser url

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C#

ASP.NET

Hi Everyone,
i am using url rewriting in my application.i want when user enter url in browser
i.e. htttp://www.abc.com or www.abc.com it will display the url i.e htttp://www.abc.com or www.abc.com respectively. but in my application it display the url i.e www.abc.com/user/index.aspx . it display the actual path in url.please help me to solvemy problem. below is my code in global.asax page

void Application_Start(object sender, EventArgs e)
        {
            // Code that runs on application startup
            RegisterRoutes(RouteTable.Routes);
        }

public static void RegisterRoutes(RouteCollection routeCollection)
     {



         routeCollection.MapPageRoute("RouteForMainCategory", "{Category}", "~/User/index.aspx");
         routeCollection.MapPageRoute("RouteForSubCategory", "{Category}/{SubCategory}", "~/User/index.aspx");
         routeCollection.MapPageRoute("RouteForMainPage", "{ }", "~/User/index.aspx");


     }