try
{
//Code Example
string url = "http://www." + TextBox1.Text;
HttpWebRequest httpReq = (HttpWebRequest)WebRequest.Create(url);
httpReq.AllowAutoRedirect = false;

HttpWebResponse httpRes = (HttpWebResponse)httpReq.GetResponse();

Label1.Text = (((HttpWebResponse)httpRes).StatusDescription);

// Close the response.
httpRes.Close();
catch
{

Label1.Text = (((HttpWebResponse)httpRes).StatusDescription);

}