Posting data as httpwebrequest and sending it as a stream, is that secure?

 I am running the code below to authorize payments but I wanted to know how secure is it to submit sensitive data like that, do I have to worry about any issues going on or no?


' create an HttpWebRequest object to communicate with Authorize.net Dim objRequest As HttpWebRequest = CType(WebRequest.Create(post_url), HttpWebRequest) objRequest.Method = "POST" objRequest.ContentLength = post_string.Length objRequest.ContentType = "application/x-www-form-urlencoded" ' post data is sent as a stream Dim myWriter As StreamWriter = Nothing myWriter = New StreamWriter(objRequest.GetRequestStream()) myWriter.Write(post_string) myWriter.Close() ' returned values are returned as a stream, then read into a string Dim objResponse As HttpWebResponse = CType(objRequest.GetResponse(), HttpWebResponse) ...