How to validate a URL in c# (Error 404)
<p>I need to write a tool that will report broken URL's in C#. The URL should only reports broken if the user see's a 404 Error in the browser.  I believe there might be tricks to handle web servers that do URL re-writing.   Here's what I have.   As you can see only some URL validate incorrectly.</p>

<pre><code>    string url = "";

    // TEST CASES
    //url = "http://newsroom.lds.org/ldsnewsroom/eng/news-releases-stories/local-churches-teach-how-to-plan-for-disasters";   //Prints "BROKEN", although this is getting re-written to good url below.
    //url = "http://beta-newsroom.lds.org/article/local-churches-teach-how-to-plan-for-disasters";  // Prints "GOOD"
    //url = "http://";     //Prints "BROKEN"
    //url = "google.com";     //Prints "BROKEN" althought this should be good.
    //url = "www.google.com";     //Prints "BROKEN" althought this should be good.
    //url = "http://www.google.com";     //Prints "GOOD"

    try
    {

        if (url != "")
        {
            WebRequest Irequest = WebRequest.Create(url);
            WebResponse Iresponse = Irequest.GetResponse();
            if (Iresponse != null)
            {
                _txbl.Text = "GOOD";
            }
        }
    }
    catch (Exception ex)
    {
        _txbl.Text = "BROKEN";
    }
</code></pre>
