How do I convert a URL in ASP.Net

I'm trying to use Context.RewritePath in protected void Application_BeginRequest to rewrite a URL but without much luck.

I want to be able to take the URL

http://secure.myapp.com/customer/atlascs

and convert this using a rewrite to

http://secure.myapp.com/Login.aspx?customer=atlascs

I've tried to use the code supplied but with no luck as I simply get told that my page cannot be found.  Any suggestions are welcomed

string fullOrigionalpath = Request.Url.ToString();
 
            if (fullOrigionalpath.Contains("/customer/"))
            {
                string customer = fullOrigionalpath.Substring(fullOrigionalpath.LastIndexOf("/"));
                Context.RewritePath("/Login.aspx?customer=" + customer);
            }

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