//You must request a ticket using HTTPS protocol
string URLAuth = "https://technet.rapaport.com/HTTP/Authenticate.aspx";
WebClient webClient = new WebClient();

NameValueCollection formData = new NameValueCollection();
formData["Username"] = "myUser";
formData["Password"] = "myPassword";
byte[] responseBytes = webClient.UploadValues(URLAuth, "POST", formData);
string ResultAuth = Encoding.UTF8.GetString(responseBytes);

//After receiving an encrypted ticket, you can use it to authenticate your session.
//Now you can choose to change the protocol to HTTP so it works faster.
//Sample URL query - http://technet.rapaport.com/HTTP/RapLink/download.aspx?ShapeIDs=1&Programmatically=yes
string URL = "GENERATED_URL_QUERY";
WebRequest webRequest = WebRequest.Create(URL);

webRequest.Method = "POST";
webRequest.ContentType = "application/x-www-form-urlencoded";
webRequest.Headers.Add(System.Net.HttpRequestHeader.AcceptEncoding, "gzip");
Stream reqStream = webRequest.GetRequestStream();
string postData = "ticket=" + ResultAuth;
byte[] postArray = Encoding.ASCII.GetBytes(postData);
reqStream.Write(postArray, 0, postArray.Length);
reqStream.Close();

WebResponse webResponse = webRequest.GetResponse();

StreamReader str;
//The following is to check if the server sending the response supports Gzip
if (webResponse.Headers.Get("Content-Encoding") != null &&
{
}
else
{
}