How to display the data on server form textbox?

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C#

C#4.0

I run my server succsessfully but when i prints data which i previously printed in console screen to address me what is going on , i want to display all that on text box , but it does not display, and when i close connection from client it displays all that information. why it happens .?

Here is my code ;

public void GetData()
 {
   Form1 f = new Form1();
   string ipadd = getip();

   IPAddress ipAd = IPAddress.Parse("192.168.0.15"); //use local m/c IP   address, and use the same in the client
   // IPAddress ip = IPAddress.Parse(ipadd);
   txtip.Text = ipAd.ToString();
   txtport.Text = "3030";
   /* Initializes the Listener */
   TcpListener myList = new TcpListener(ipAd, 3030);

   /* Start Listeneting at the specified port */

   myList.Start();

   txtdata.Text = "The server is running at port 3030...";
   txtdata.Text = txtdata.Text + Environment.NewLine + "The local End point  is :" + myList.LocalEndpoint;
   txtdata.Text = txtdata.Text + Environment.NewLine + "Waiting for a   connection.....";



   Socket s = myList.AcceptSocket();

    txtdata.Text = txtdata.Text + Environment.NewLine +"Connection accepted from " + s.RemoteEndPoint;
   // txtdata.Text = "Connection accepted from " + s.RemoteEndPoint;

   }

Look at the code above when i write data on console it works but the same i want to print on txtdata (textbox) but it doesn't print , till connection close by client.