≥∇≤)b

private void SetText(string text)
{
// InvokeRequired required compares the thread ID of the
// calling thread to the thread ID of the creating thread.
// If these threads are different, it returns true.
if (this.textBox1.InvokeRequired)
{
    SetTextCallback d = new SetTextCallback(SetText);
    this.Invoke(d, new object[] { text });
}
else
{
    this.textBox1.Text = text;
}
}

void SetTextdele(string str)
{
	if(this.Dispatcher.Thread != Thread.CurrentThread)
	{
		ts = new TextSet(SetTextdele);
		Dispatcher.Invoke(ts, str);
	}
	else
	{
		this.label1.Content = str;
	}
}