WinForms Cross Threading problem

Sooner or later WinForms programmer will encounter cross threading problem when object created in one thread tries access to another, not create in it.

Here are quick guide how to manage that.

<br />// Members<br />delegate void SetTextCallback( string text );<br />private Thread demoThread = null;<br /><br />// Events<br />private void setTextSafeBtn_Click(object sender, EventArgs e) {<br />this.demoThread = new Thread(new ThreadStart(this.ThreadProcSafe));<br /> this.demoThread.Start();<br />}<br /><br />// Methods<br />private void ThreadProcSafe() {<br />this.SetText("This text was set safely.");<br />}<br />private void SetText(string text) {<br /> if (this.textBox1.InvokeRequired) {<br /> SetTextCallback d = new SetTextCallback(SetText);<br /> this.Invoke(d, new object[] { text });<br /> }<br /> else {<br /> this.textBox1.Text = text;<br /> }<br />}<br />