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    <p>Because of its limited functionality, I avoid using <code>WebClient</code> and use <code>WebRequest</code> instead. The code below: </p> <ol> <li>does not expect an HTTP 100 status code to be returned,</li> <li>creates a <code>CookieContainer</code> to store any cookies we pick up, </li> <li>sets the <em>Content Length</em> header, and</li> <li><code>UrlEncode</code>s each value in the post data.</li> </ol> <p>Give the following a try and see if it works for you.</p> <pre><code>System.Net.ServicePointManager.Expect100Continue = false; System.Net.CookieContainer cookies = new System.Net.CookieContainer(); // this first request just ensures we have a session cookie, if one exists System.Net.WebRequest req = System.Net.WebRequest.Create("http://localhost/test.aspx"); ((System.Net.HttpWebRequest)req).CookieContainer = cookies; req.GetResponse().Close(); // this request submits the data to the server req = System.Net.WebRequest.Create("http://localhost/test.aspx"); req.ContentType = "application/x-www-form-urlencoded"; req.Method = "POST"; ((System.Net.HttpWebRequest)req).CookieContainer = cookies; string parms = string.Format("email={0}&amp;password={1}", System.Web.HttpUtility.UrlEncode("e2@email.com"), System.Web.HttpUtility.UrlEncode("hunter2")); byte[] bytes = System.Text.Encoding.ASCII.GetBytes(parms); req.ContentLength = bytes.Length; // perform the POST using (System.IO.Stream os = req.GetRequestStream()) { os.Write(bytes, 0, bytes.Length); } // read the response string response; using (System.Net.WebResponse resp = req.GetResponse()) { if (resp == null) return; using (System.IO.StreamReader sr = new System.IO.StreamReader(resp.GetResponseStream())) { response = sr.ReadToEnd().Trim(); } } // the variable response holds the results of the request... </code></pre> <p>Credits: <a href="http://www.hanselman.com/blog/HTTPPOSTsAndHTTPGETsWithWebClientAndCAndFakingAPostBack.aspx" rel="nofollow noreferrer">Hanselman</a>, <a href="https://stackoverflow.com/questions/2938330/httpwebrequest-response-produces-http-422-why/2939727#2939727">Simon</a> (SO Question)</p>
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