title: HttpWebRequest C# uploading a file
body: <p>using C#, I'm trying to integrate my web store w/ an email marketing client. I want to upload a comma delimited file of subscribers once a night. They say to get this to work, it has to be a form posts: multipart/form-data, but I'm not using a form. I'm able to connect to their servers but I keep getting back a Data can't be blank. Can anyone help me to get this working? </p>
  
  <pre><code>public static string Create()
      {
          string authInfo = "username" + ":" + "password";
  
          string root = AppDomain.CurrentDomain.BaseDirectory;
          string file = root + "Folder\\work.txt";
  
          FileInfo fi = new FileInfo(file);
          int fileLength = (int)fi.Length;
  
          FileStream rdr = new FileStream(file, FileMode.Open);
  
          HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
          httpWebRequest.Method = "POST";
          httpWebRequest.ContentType = "application/x-www-form-urlencoded";
          httpWebRequest.Accept = "application/xml";
  
          authInfo = Convert.ToBase64String(Encoding.Default.GetBytes(authInfo));
          httpWebRequest.Headers["Authorization"] = "Basic " + authInfo;
          byte[] requestBytes = new byte[fileLength];
  
          int bytesRead = 0;
          httpWebRequest.ContentLength = requestBytes.Length;
          using (Stream requestStream = httpWebRequest.GetRequestStream())
          {
              while ((bytesRead = rdr.Read(requestBytes, 0, requestBytes.Length)) != 0)
              {
                  requestStream.Write(requestBytes, 0, bytesRead);
                  requestStream.Close();
              }
          }
          //READ RESPONSE FROM STREAM
          string responseData;
          using (StreamReader responseStream = new StreamReader(httpWebRequest.GetResponse().GetResponseStream()))
          {
              responseData = responseStream.ReadToEnd();
              responseStream.Close();
          }
          return responseData;
      }
  </code></pre>