my url routing is not performing well:

Question

my url routing is not performing well:

global.asax:

<%@ Import Namespace="System.Web.Routing" %>

<script runat="server">

void Application_Start(object sender, EventArgs e)

{

// Code that runs on application startup

RegisterCustomRoutes(RouteTable.Routes);

}

public static void RegisterCustomRoutes(RouteCollection routeCollection)

{

routeCollection.MapPageRoute("AllAuthorRoute","author/{letter}","~/AllAuthor.aspx?");

}

index.aspx.cs :

protected void DataList2_ItemCommand(object source, DataListCommandEventArgs e)

{

if (e.CommandName == "AuthorAZ")

{

Response.Redirect(GetRouteUrl("AllAuthorRoute", null) + e.CommandArgument.ToString());

}

}

But the problem is does not find right path and got error