I’m using a shared hosting account for my web site. I have no control over the
                                    file types (extensions) that are handled by ASP.NET — only the standard file
                                    extensions (ASPX, ASMX, etc.) are supported. By request, I was asked to make my old
                                    RSS and Atom XML file feeds up to date with my new blog posts. During the
                                    transitions I’ve made, I may have lost some subscribers as I hadn’t kept
                                    them up to date as much as I would have liked.
                                
                                
                                    So, with a wave of the magic ASP.NET wand and a little 404 magic, the two XML files
                                    are now serving up content from my new WordPress installation. On my web host, I can
                                    modify what pages handle 404 web server errors (file not found). I changed the
                                    setting to point to a new ASPX file, appropriately named, 404.aspx. Here’s
                                    what it contains:
                                
                                <%@ Page Language="C#" %>
<%
    string qstr = HttpUtility.UrlDecode(Request.QueryString.ToString());
    if (qstr.Contains("index.xml") || qstr.Contains("atom.xml"))
    {
        string movedTo = "http://feeds.feedburner.com/wiredprairie";
        Response.Status = "301 Moved Permanently";
        Response.AddHeader("Location", movedTo);
        Response.End();
        return;
    }
    Response.Status = "404 Not Found";        
    Response.End();
    return;
%>
                                
                                    I grab the query string which
                                    minimally contains the requested Url, and if it’s either atom.xml or
                                    index.xml, I redirect to the FeedBurner location for the
                                    RSS feed. If it wasn’t
                                    one of those files, I just return a 404 error and quit (as I don’t have a
                                    custom 404 page developed).
                                
                                
                                    Of course, with a bit more robust coding, this could handle a wider variety of cases
                                    and redirect to far more web pages. Or, you can just point to my RSS feed. :)