Returned results of ASP. net post access to the internet interface

Code
String postdata = string. Format ("A = 1 & B = 2"); // post Parameters
Stream outstream = NULL;
Stream instream = NULL;
Streamreader sr = NULL;
Httpwebresponse response = NULL;
Httpwebrequest request = NULL;
Encoding encoding = encoding. default;
Byte [] DATA = encoding. getbytes (postdata );
// Prepare the request
Try
{
// Set parameters
Request = webrequest. Create ("http://www.bbb.com") as httpwebrequest;
Cookiecontainer = new cookiecontainer ();
Request. cookiecontainer = cookiecontainer;
Request. allowautoredirect = true;
Request. method = "Post ";
Request. contenttype = "application/X-WWW-form-urlencoded ";
Request. contentlength = data. length;
Outstream = request. getrequeststream ();
Outstream. Write (data, 0, Data. Length );
Outstream. Close ();
// Send the request and obtain the response data
Response = request. getresponse () as httpwebresponse;
// The POST request is not sent to the target webpage until the request. getresponse () program starts.
Instream = response. getresponsestream ();
Sr = new streamreader (instream, encoding );
// Return result webpage (HTML) Code
Return Sr. readtoend ();
}
Catch
{
Return NULL;
}