title: c# smartdevice - HTTPWEBREQUEST GET vs POST InvalidOperationException
body: <p>In the code below, DoGet is working very stable. But DoPost throws an <strong>uncatcheable InvalidOperationException</strong> randomly. I am lost. Any pointers will be of immense help.</p>
  
  <pre><code>/*
      Environment
      -------------
      * NET CF 2.0
      * WM 5.0(USA Mobile Pocket PC Emulator)
      * Windows XP Professional SP2
      * VS 2008
  */
  
  /*
      The exception
      ------------------
     at System.Net.HttpWebRequest.set_ContentLength(Int64 value)
     at System.Net.HttpWebRequest.BufferConnectStream.WritingSucceeds()
     at System.Net.HttpWriteStream.doClose()
     at System.Net.HttpWriteStream.Finalize()
  */
  
  public static string DoPost(string url)
  {
      // initialize from variables
      string responseString = string.Empty;
      ASCIIEncoding encoding = new ASCIIEncoding();
      HttpWebResponse response;
      byte[] data = encoding.GetBytes("dummy");
      StreamReader reader;
      HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
  
      //do the processing
      SetRequestProperties(request, "POST"); // SETTING METHOD TO POST HERE
      request.GetRequestStream().Write(data, 0, data.Length);
      request.GetRequestStream().Close();
      response = (HttpWebResponse)request.GetResponse();
      reader = new StreamReader(response.GetResponseStream());
      responseString = reader.ReadToEnd();
  
      //clean up
      response.Close();
      response.GetResponseStream().Close();
      response.GetResponseStream().Dispose();
      reader.Close();
      reader.Dispose();
      reader = null;
      response = null;
      request = null;
      encoding = null;
  
      //return
      MessageBox.Show("POST SUCCESS");
      return responseString;
  
  }   
  
  public static string DoGet(string url)
  {
      // initialize from variables
      string responseString = string.Empty;
      ASCIIEncoding encoding = new ASCIIEncoding();
      HttpWebResponse response;
      byte[] data = encoding.GetBytes("dummy");
      StreamReader reader;
      HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
  
      //do the processing
      SetRequestProperties(request, "GET");  // SETTING METHOD TO GET HERE
      response = (HttpWebResponse)request.GetResponse();
      reader = new StreamReader(response.GetResponseStream());
      responseString = reader.ReadToEnd();
  
      //clean up
      response.Close();
      response.GetResponseStream().Close();
      response.GetResponseStream().Dispose();
      reader.Close();
      reader.Dispose();
      reader = null;
      response = null;
      request = null;
      encoding = null;
  
      //return
      MessageBox.Show("GET SUCCESS"); 
      return responseString;
  
  }
  
  private static void SetRequestProperties(HttpWebRequest request, string s)
  {
      request.Method = s;
      request.AllowWriteStreamBuffering = true;
      request.KeepAlive = false;
      request.ContentType = "application/x-www-form-urlencoded";
      request.SendChunked = false;
      request.Credentials = CredentialCache.DefaultCredentials;
      request.UserAgent = "my mobile user agent";
      request.Timeout = 60000;
      request.ProtocolVersion = new System.Version("1.1");
  }
  </code></pre>