What's wrong with calling Invoke, regardless of InvokeRequired?

Question

I\'ve seen the common setup for cross threading access to a GUI control, such as discussed here: Shortest way to write a thread-safe access method to a windows forms control

Answer 1

If you try to invoke before a window handle is created (for example, when calling form constructor), you will get an InvalidOperationException. So, generally InvokeRequired check is required.

See MSDN for details.