Updating GUI (WPF) using a different thread

You can use Dispatcher.Invoke to update your GUI from a secondary thread.

Here is an example:

    private void Window_Loaded(object sender, RoutedEventArgs e)    {        new Thread(DoSomething).Start();    }    public void DoSomething()    {        for (int i = 0; i < 100000000; i++)        {               this.Dispatcher.Invoke(()=>{               textbox.Text=i.ToString();               });            }     }

You may use a delegate to solve this issue.Here is an example that is showing how to update a textBox using diffrent thread

public delegate void UpdateTextCallback(string message);private void TestThread(){    for (int i = 0; i <= 1000000000; i++)    {        Thread.Sleep(1000);                        richTextBox1.Dispatcher.Invoke(            new UpdateTextCallback(this.UpdateText),            new object[] { i.ToString() }        );    }}private void UpdateText(string message){    richTextBox1.AppendText(message + "\n");}private void button1_Click(object sender, RoutedEventArgs e){   Thread test = new Thread(new ThreadStart(TestThread));   test.Start();}

TestThread method is used by thread named test to update textBox

there.

I am also developing a serial port testing tool using WPF, and I'd like to share some experience of mine.

I think you should refactor your source code according to MVVM design pattern.

At the beginning, I met the same problem as you met, and I solved it using this code:

new Thread(() => {    while (...)    {        SomeTextBox.Dispatcher.BeginInvoke((Action)(() => SomeTextBox.Text = ...));    }}).Start();

This works, but is too ugly.I have no idea how to refactor it, until I saw this:http://www.codeproject.com/Articles/165368/WPF-MVVM-Quick-Start-Tutorial

This is a very kindly step-by-step MVVM tutorial for beginners.No shiny UI, no complex logic, only the basic of MVVM.