C sharp socket recieve виснет

Здравствуйте! По какой причине программа может виснуть до получения ответа на string answer = ReceiveDataFromServer();? Т.е. пока не получит сокет в ответ. Если она не получает просто висит. Если получает - то поломанная кодировка.

namespace HotKeyTest
{
public partial class Form1 : Form
{
    // Receiving byte array  
    byte[] bytes = new byte[1024];
    Socket senderSock;
    public Form1()
    {
        InitializeComponent();
        Boolean success = Form1.RegisterHotKey(this.Handle, this.GetType().GetHashCode(), 0x0002, 0x4c);//Set hotkey as 'ctrl+l'
    }
    private void button1_Click(object sender, EventArgs e)
    {
        StreamReader sr = new StreamReader("settings");
        IPAddress ip = IPAddress.Parse(sr.ReadLine());
        Connect(ip);
        sr.Close();
        Thread.Sleep(2000);
        Sendswitch();
        Disconnect();
    }
    private void Connect(IPAddress ip)
    {
        try
        {
            // Create one SocketPermission for socket access restrictions 
            SocketPermission permission = new SocketPermission(
                NetworkAccess.Connect,    // Connection permission 
                TransportType.Tcp,        // Defines transport types 
                "",                       // Gets the IP addresses 
                SocketPermission.AllPorts // All ports 
                );
            // Ensures the code to have permission to access a Socket 
            permission.Demand();
            // Resolves a host name to an IPHostEntry instance            
            IPHostEntry ipHost = Dns.GetHostEntry("");
            // Gets first IP address associated with a localhost 
            IPAddress ipAddr = ip;
            // Creates a network endpoint 
            IPEndPoint ipEndPoint = new IPEndPoint(ipAddr, 55443);
            // Create one Socket object to setup Tcp connection 
            senderSock = new Socket(
                ipAddr.AddressFamily,// Specifies the addressing scheme 
                SocketType.Stream,   // The type of socket  
                ProtocolType.Tcp     // Specifies the protocols  
                );
            senderSock.NoDelay = false;   // Using the Nagle algorithm 
            // Establishes a connection to a remote host 
            senderSock.Connect(ipEndPoint);
        }
        catch (Exception exc) { MessageBox.Show(exc.ToString()); }
    }
    private void Sendswitch()
    {
        try
        {
            // Sending message 
            //<Client Quit> is the sign for end of data 
            byte[] msg = Encoding.Unicode.GetBytes("{\"id\":1,\"method\":\"get_prop\",\"params\":[\"power\", \"not_exist\", \"bright\"]}");
            // Sends data to a connected Socket. 
            int bytesSend = senderSock.Send(msg);
            Thread.Sleep(2000);
            string answer = ReceiveDataFromServer();
            MessageBox.Show(answer);
        }
        catch (Exception exc) { MessageBox.Show(exc.ToString()); }
    }
    private string ReceiveDataFromServer()
    {
        try
        {
            // Receives data from a bound Socket. 
            int bytesRec = senderSock.Receive(bytes);
            // Converts byte array to string 
            String theMessageToReceive = Encoding.Unicode.GetString(bytes, 0, bytesRec);
            // Continues to read the data till data isn't available 
            while (senderSock.Available > 0)
            {
                bytesRec = senderSock.Receive(bytes);
                theMessageToReceive += Encoding.Unicode.GetString(bytes, 0, bytesRec);
            }
            return theMessageToReceive;
        }
        catch (Exception exc) { return exc.ToString(); }
    }
    private void Disconnect()
    {
        try
        {
            // Disables sends and receives on a Socket. 
            senderSock.Shutdown(SocketShutdown.Both);
            //Closes the Socket connection and releases all resources 
            senderSock.Close();
        }
        catch (Exception exc) { MessageBox.Show(exc.ToString()); }
    }
}

}