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1. Query the control's InvokeRequired property.

2. If InvokeRequired returns true, call Invoke with a delegate that makes the actual call to the control.

3. If InvokeRequired returns false, call the control directly.



In the following code example, this logic is implemented in a utility method called SetText.

A delegate type named SetTextDelegate encapsulates the SetText method.

When the TextBox control's InvokeRequired returns true, the SetText method creates an instance

of SetTextDelegate and calls the form's Invoke method.

This causes the SetText method to be called on the thread that created the TextBox control,

and in this thread context the Text property is set directly