Pass Proxy Server URL rto HTTPWebRequest

            HttpWebRequest webRequest = null;
            string strResult = null;
            try
            {
                // Create a new web request
                webRequest = WebRequest.Create(url) as HttpWebRequest;
                // Check if ProxyServerUrl in the appSettings is not empty
                if (!string.IsNullOrEmpty(WebConfigurationManager.AppSettings["ProxyServerUrl"].ToString()))
                {
                    // instantiate a new WebProxy class and send the ProxyServerUrl to the contructor parameter
                    System.Net.WebProxy proxy = new System.Net.WebProxy(WebConfigurationManager.AppSettings["ProxyServerUrl"].ToString(), 

true);
                    // Set the proxy credentials
                    proxy.Credentials = new NetworkCredential(WebConfigurationManager.AppSettings["PassThroughUser"].ToString(),

 WebConfigurationManager.AppSettings["PassThroughPwd"].ToString());
                    // Set the WebRequest proxy property by the WebProxy class already configured
                    webRequest.Proxy = proxy;
                }
                // Read the response
                using (StreamReader sr = new StreamReader(webRequest.GetResponse().GetResponseStream()))
                {
                    // Set strResult to the response
                    strResult = sr.ReadToEnd();
                }
            }
            catch
            {
            }