Hello,

This is a code about serial port connection in POCKET PC. This code uses serial port Data_Recive Event. When data enter the input buffer it is read and shown in logTextBox.

Problem: When I want to close the port, the system freezes completely.
I am using .net compact framework 2.0 Sp2 and visual studio.net 2005 and
C# language.

Thanks,
Sadeghi


public partial class MainForm : Form
{
private Delegate UpdateHandler;
private void DoUpdate(Object s, EventArgs e)
{
logTextBox.Text += ReadLineBuffer;
}
private void serialPort_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
ReadLineBuffer = serialPort.ReadLine();
this.Invoke(UpdateHandler);
}

private void MainForm_Load(object sender, EventArgs e)
{
serialPort.Handshake = Handshake.None;
UpdateHandler = new EventHandler(DoUpdate);
}
private void connectMenuItem_Click(object sender, EventArgs e)
{
if (serialPort.IsOpen == false)
{
try
{
serialPort.Open();
this.serialPort.DataReceived += new System.IO.Ports.SerialDataReceivedEventHandler(this.serialPort_DataReceived);
}
catch(IOException Exeption)
{
MessageBox.Show(Exeption.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Hand,MessageBoxDefaultButton.Button1);
}


}

private void disconnectMenuItem_Click(object sender, EventArgs e)
{
if (serialPort.IsOpen == true)
{
try
{
serialPort.DiscardInBuffer();
serialPort.DiscardOutBuffer();
this.serialPort.DataReceived -= new System.IO.Ports.SerialDataReceivedEventHandler(this.serialPort_DataReceived);
serialPort.Close(); //Error
}
catch (IOException Exeption)
{
MessageBox.Show(Exeption.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Hand, MessageBoxDefaultButton.Button1);
}
}
}