Got exception , "the filter indicated that the application is busy"

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C#

C#4.0

I got above exception in my application. that's the reason why data not displayed on text box. anyone help me. I want to run form1 on main UI thread . How to do that?

here is my code,
I have 2 classes , form1 and handleClient.cs . Got exception at AppendTxtdata method at bold line.

here is Form1.cs

namespace connectSuccess
{
    public partial class Form1 : Form
    {
        private handleClient handleClient;
        private bool IsRunning = false;
        TcpListener serverSocket;
        TcpClient clientSocket;
     

        public Form1()
        {
            InitializeComponent();
        }

        public Form1(handleClient handleClient)
        {
            // TODO: Complete member initialization
            this.handleClient = handleClient;
        }


        private void Form1_Load(object sender, EventArgs e)
        {
            string ipaddre = getip();
            IPAddress iP = IPAddress.Parse(ipaddre);
            AppendTxtip(iP.ToString());
        }


        private void btnstart_Click(object sender, EventArgs e)
        {
           new Thread(startServer).Start();
          
        }


        public  void startServer()
        {
            try
            {
                int port = Convert.ToInt32(txtport.Text);
                string ipaddre = getip();
                IPAddress iP = IPAddress.Parse(ipaddre);
                // AppendTxtip(iP.ToString());
                serverSocket = new TcpListener(iP, port);
                clientSocket = default(TcpClient);
                int counter = 0;
                serverSocket.Start();
               AppendTxtdata("Server Started , Waiting for Client Connection" + Environment.NewLine);

                IsRunning = true;

                while (IsRunning)
                {
                    counter += 1;
                    clientSocket = serverSocket.AcceptTcpClient();
                    AppendTxtdata(" >> " + "Client No:" + Convert.ToString(counter) + " Connected-- IP --" + clientSocket.Client.RemoteEndPoint.ToString() + "");
                    AppendTxtdata(Environment.NewLine);
                    handleClient client = new handleClient();
                    client.startClient(clientSocket, Convert.ToString(counter));
                    // break;
                }
               
            }
            catch { }
            finally { }
        }


        public void StopServer()
        {
            IsRunning = false;       
        }


        static string getip() // to get ip addrees of machine on which this app installed //
        {
            IPHostEntry host;
            string localIP = "?";
            host = Dns.GetHostEntry(Dns.GetHostName());

            foreach (IPAddress ip in host.AddressList)
            {
                if (ip.AddressFamily == AddressFamily.InterNetwork)
                {
                    localIP = ip.ToString();                
                }
            }
            return localIP;
        }


        public void AppendTxtip(string value)
        {
            if (InvokeRequired)
            {
                this.Invoke(new Action<string>(AppendTxtip), new object[] { value });
                return;
            }
            txtip.Text += value;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {

               AppendTxtdata("Data sent to Client No : " + clientSocket.Client.RemoteEndPoint + Environment.NewLine);
               this.clientSocket.Close();
               this.serverSocket.Stop();
               
            }
            catch { }
        }

       
        public void AppendTxtdata(string myval)
        {
            try
            {
            
                if (InvokeRequired)
                {
                        this.Invoke(new Action<string>(AppendTxtdata), new object[] { myval });
                        return;
                }
                txtdata.Text += myval;
            }
            catch { }
        }
    
    }   
}

here is HandleClient.cs

public class handleClient
{

    public static SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["Database1"].ToString());
    SqlCommand cmd;
    DataTable table;
    SqlDataAdapter adapter;
    ASCIIEncoding asen = new ASCIIEncoding();
    TcpClient clientSocket;

    string clNo;
    byte[] coma, star, hash, SQLDATA;


    public void startClient(TcpClient inClientSocket, string clineNo)
    {
        this.clientSocket = inClientSocket;
        inClientSocket.NoDelay = true;
        this.clNo = clineNo;
      //  GetData();
        new Thread(GetData).Start();
    }


    public void GetData() // to run server //
    {
        try
        {
            con.Open();

            Form1 f = new Form1();
            NetworkStream networkStream = clientSocket.GetStream();

            for (int p = 0; p >= 0; p++)
            {
                byte[] b = new byte[100];

                int k = networkStream.Read(b, 0, b.Length);

                f.AppendTxtdata("The Data from Client ( " + clNo + " ) Recieved..." + Environment.NewLine);

                for (int i = 0; i < k; i++)
                {
                    f.AppendTxtdata("" + Convert.ToChar(b[i]));
                }

                f.AppendTxtdata(Environment.NewLine);

                var j = b.Length - 1;
                while (b[j] == 0)
                {
                    --j;
                }

                var temp = new byte[j + 1];
                Array.Copy(b, temp, j + 1);

                string res = System.Text.Encoding.ASCII.GetString(temp);

                switch (res.Substring(0, 1))
                {
                   //all stuff here
                }
            }
        }
        catch { }
        finally { con.Close(); }
    }
}

edited
here is Globalvariable class.

class Globalvariable
   {
       public static string SomeData = "";
   }

here is edited Appendtxtdata method

public void AppendTxtdata(string myval)
{
    try
    {
       // Globalvariable.SomeData += "I am from form 1 \r\n";
        if (InvokeRequired)
        {
            this.Invoke(new Action<string>(AppendTxtdata), new object[] {myval });
            return;
        }
        Globalvariable.SomeData += myval;
    }
    catch { }
    txtdata.Text = Globalvariable.SomeData;

}

Now this shows data in textbox but after stoping server or closing tcpclient and tcplistener objects. but i want to show data without closing those objects how to do this way i.e clicking stop button code is here of stop button,

private void button1_Click(object sender, EventArgs e)
{
    try
    {

        AppendTxtdata("Data sent to Client No : " + clientSocket.Client.RemoteEndPoint + Environment.NewLine);
        this.clientSocket.Close();
        this.serverSocket.Stop();

    }
    catch { }
}