Send url with web client

[Zv00n]

When I tried to the following link url on address bar, response is "OK"\[code\]http://ww.exmaple.com.tr/webservices/addlead.php?first_name=" + r.Name + "&last_name=" + r.Surname + "&phone=" + r.Telephone + "&hash=" + r.HashCode\[/code\]But when I tried to link with webclient like the below, response is "AUTH ERROR" \[code\]string URI = "http://ww.exmaple.com.tr/webservices/addlead.php";string myParameters = "first_name=" + r.Name + "&last_name=" + r.Surname + "&phone=" + r.Telephone + "&hash=" + r.HashCode;using (WebClient wc = new WebClient()){ wc.Headers[HttpRequestHeader.ContentType] = "application/x-www-form-urlencoded"; string HtmlResult = wc.UploadString(URI, myParameters);}\[/code\]How can I solve this problem?