Cross-thread operation not valid while listening to a COM port [duplicate]

Answer 1

You can also do the following whenever accessing a UI control from a different thread than the one it was created on:

(.NET 3.5)

myControl.BeginInvoke(new MethodInvoker( () => myControl.whatever = whatever; ));

or (.NET 2.0)

myControl.BeginInvoke(new MethodInvoker( delegate { myControl.whatever = whatever; ));

edit> Sometimes using Invoke for a long running operation can/will still hang the ui, using BeginInvoke obviously performs that operation asynchronously, and the ui will not hang.