Hello,
My program has no form and begin with a module, which start a timer within a class named stuff :
The timer start well, but just for one cycle, then my program is stop when the line "End" is reached of the main module. How to not stop (quit) the program and let the timer do its job until my program stop the timer ? Where to put the line below ?

Can you provide an example program for us to look at. I can't see what's in 'stuff'.

This works: -

 You're right, I was in the mistake. Thanks !