try 
        { 
            r = request.GetResponse(); 
            r.Close(); 
            GridView1.DataSource = RSS(url);
            GridView1.DataBind();
}
catch (Exception) 
        { 
            Response.Write("Invalid URL"); 
        }

protected void Page_Load(object sender, EventArgs e)
    {

        Uri url = new Uri("http//...");
        WebRequest request = WebRequest.Create(url);
        request.Method = "HEAD";
        WebResponse r;

 Dim x, ConnStr, str, cn, cmd, rs, strSQL
   
   'collect values
   word=Request.QueryString("word")
	
end