How to check for url accessibility before providing a urlfield ?

See My Answer : http://forums.asp.net/t/1822133.aspx/1?Check+whether+url+or+file+exist+

http://forums.asp.net/t/1826870.aspx/1?How+to+check+for+url+accessibility+before+providing+a+urlfield+

Reffered To My Answer

These links

http://stackoverflow.com/questions/7226599/asp-net-how-to-check-if-a-file-exist-on-external-server-given-web-address

http://forums.asp.net/t/1122054.aspx/1

 bool exist = false;
 try
 {
      HttpWebRequest request = (HttpWebRequest)System.Net.WebRequest.Create("http://www.example.com/image.jpg");
      using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
      {
           exist = response.StatusCode == HttpStatusCode.OK;
      }
 }
 catch
 {
 }

And if In Internal Server in your Project you can use Login of File.Find (you can check before Redirecting..  that project file exist or not?)

Do a File.Exists on the page.

  if(File.Exists(Server.MapPath("~/SomePage.aspx")))
    Response.Redirect("~/SomePage.aspx");

You'll need to use the System.IO namespace.

Good Luck`

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