App freezes after Dispatcher.Invoke

I have this application that freezes when calling the dispatcher.invoke for any control.

When i Call the Dispatcher in radiobutton, Grid, Image..etc the App freezes but without giving errors. any help please !!! thank you

I call the thread Method RunClient

private void RunClient()
    {

        TcpClient client;

        // instantiate TcpClient for sending data to server
        try
        {
            // Step 1: create TcpClient and connect to server

            client = new TcpClient();
            client.Connect(ip, 5001);

            // Step 2: get NetworkStream associated with TcpClient
            output = client.GetStream();

            // create objects for writing and reading across stream
            writer = new BinaryWriter(output);
            reader = new BinaryReader(output);

            string theReply = "";

            do
            {
                try
                {
                    // read the string sent to the server
                    theReply = reader.ReadString();

                    int i = 0;

                    foreach (var x in theReply.Split('#'))
                    {
                        ReadString[i] = x;
                        i++;
                    }

                    CheckConnection(ReadString[0]);



                }
                catch (Exception)
                {
                    //do nothing
                }

            } while (ReadString[6].Equals(" ") &&
                   connection.Connected);

            updatelabel = () => GameResult(ReadString[6]);
            Dispatcher.Invoke(new Action(updatelabel));

            if (!connection.Connected)
            {
                MessageBox.Show("The connection was lost. The game will be closed automatically.");
                writer.Close();
                reader.Close();
                output.Close();
                connection.Close();
                this.Close();
            }

        }
        // handle exception if error in establishing connection
        catch (Exception error)
        {
            MessageBox.Show("Check Internet Connectivity. Couldn't connect!");
        }


    }

when the code enters the method ( check connection ) and calls the dispatcher the app freezes.

     void CheckConnection(string ii)
    {
        try
        {
            if (ii.Equals("Connected"))
            {
                MessageBox.Show("A Connection was established");




                int x = Convert.ToInt32(ReadString[1]);

                if (x == 1)
                {

                    updatelabel = () => char1RadioButton2.IsEnabled = false;
                    char1RadioButton2.Dispatcher.Invoke(new Action(updatelabel));
                }

                else
                {
                    updatelabel = () => char5RadioButton2.IsEnabled = false;
                    char5RadioButton2.Dispatcher.Invoke(new Action(updatelabel));
                }


                updatelabel = () => CreatingGameGrid.Visibility = System.Windows.Visibility.Visible;
                CreatingGameGrid.Dispatcher.Invoke(new Action(updatelabel));



                updatelabel = () => JoinGameGrid.Visibility =        System.Windows.Visibility.Visible;
                JoinGameGrid.Dispatcher.Invoke(new Action(updatelabel));

            }
            else
            {
                MessageBox.Show("No Such Game found");
                this.Close();
            }
        }
        catch (Exception x)
        {
            MessageBox.Show(x.ToString());
        }
    }