Question : Reading xml file in global.asax to redirect vanity url to correct page

I have created a xml file that has a vanity url and the redirect url. I want global asax to read this file to redirect the page request to the appropiate page. So for example if someone types in http://www.company.com/products have that be redirected to http://www.company.com/siteproducts/default.aspx. Below is some code I wrote.

<?xml version="1.0" encoding="utf-8" ?>
<redirectlinks>
<link vanityurl="products" redirecturl="/siteproducts/default.aspx?WT.MC_ID=23" />
<link vanityurl="compare" redirecturl="/siteproducts/default.aspx?WT.MC_ID=24" />
</redirectlinks>

global.asax

void Application_BeginRequest(object sender, EventArgs e)
{
string strThisUrl;
string strRedirectLink;
XmlDocument doc = new XmlDocument();
doc.Load(Server.MapPath("/redirects.xml"));
XmlNodeReader nodeReader = new XmlNodeReader(doc);
XmlReaderSettings settings = new XmlReaderSettings();
settings.IgnoreComments = true;
settings.IgnoreProcessingInstructions = true;
settings.IgnoreWhitespace = true;
XmlReader reader = XmlReader.Create(nodeReader, settings);
while (reader.Read())
{
switch (reader.NodeType)
{
case XmlNodeType.Element:
strThisUrl = Request.Path.ToLower();
string newUrl = strThisUrl.Replace("/Default.aspx", "").Replace("/", "");
if (reader.Name == "link" && (reader.GetAttribute("vanityurl") == newUrl))
{
strRedirectLink = reader.GetAttribute("redirecturl");
Response.Redirect(strRedirectLink);

}
break;
}

}
}

Any ideas on how to get this to work is greatly appreciated.

Answer : Reading xml file in global.asax to redirect vanity url to correct page

What you want is called a pipeline. Here is a tutorial:
http://www.nerdymusings.com/LPMArticle.asp?ID=12

I would take your code that parses the XML file and make that a standalone class. And then store the values of the XML parsing as properties of the class.

That way the pipeline class just has to do this:

                       
             private void Application_BeginRequest(object Source, EventArgs e)
{
      HttpApplication oApp=(HttpApplication) Source;
      String strRequestUri = oApp.Request.Url.AbsoluteUri.ToLower();

      RedirectMap map =new RedirectMap();

      if (map.IsMapped(strRequestUri))
          oApp.Response.Redirect(map.GetRedirectUri(strRequestUri));
}