keeping code running in main form when new forms are opened in c#

[snarkysparky]

In my main form I have a timer that is doing periodic work that I want to keep happening when a new form is opened.

The work involves checking a TCP listener for connections as well as other non GUI communicating with hardware.

If a modal form is opened does this timer in the parent form keep running even though the parent form GUI is inactive ?

Thanks

[IanB]

Why don't you test it?

Arrange for the timer to write periodic messages out to the console window (or debug window), and then watch to see if these messages keep coming while the modal form is open.

[snarkysparky]

I have tested.  Timer does keep going.  But I really really would like to know that this is the expected result and not just a fluke.

Thanks

[zzattack]

Opening a modal form on top of another one does not block the obscured one's message loop, so yes this is as expected.