C# socket with AT Cmds

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C#

Hi,

I am trying to make socket connection to dongle and sending AT commands to that. I am able to connect to server and also able send the command but when I am trying to receive respose from it, connection gets hanged. It is not even raising any exception. The same code it running fine with VC++. I have used send and receive API of winsock. Can someone tell me what could be reason.

Encoding ASCII = Encoding.ASCII;
            string AtCmd = "AT%MEAS=\"2\"";
            Byte[] ByteGet = ASCII.GetBytes(AtCmd);
            Byte[] RecvBytes = new Byte[1024];
            String strRetPage = null;

            // IPAddress and IPEndPoint represent the endpoint that will
            //   receive the request.
            // Get the first IPAddress in the list using DNS.
            string server = "127.0.0.1";
            IPAddress hostadd = Dns.Resolve(server).AddressList[0];
            IPEndPoint EPhost = new IPEndPoint(hostadd, 9999);

            //Creates the Socket for sending data over TCP.
            Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream,ProtocolType.Tcp);

            // Connects to the host using IPEndPoint.
            s.Connect(EPhost);
            if (!s.Connected)
            {
                strRetPage = "Unable to connect to host";
               // return strRetPage;
            }

            // Sends the GET text to the host.
            if (s.Send(ByteGet, ByteGet.Length, SocketFlags.None) == ByteGet.Length)
            {

                // Receives the page, looping until all bytes are received
Int32 bytes = s.Receive(RecvBytes, RecvBytes.Length, 0); ---> Here it gets stuck
                while (bytes > 0)
                {
                    bytes = s.Receive(RecvBytes, RecvBytes.Length, SocketFlags.None);
                    strRetPage = strRetPage + ASCII.GetString(RecvBytes, 0, bytes);
                }

                 }
	    }