How to execute code before a control is "unloaded/closed"

  • Thread starter Thread starter BobRoyAce
  • Start date Start date
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BobRoyAce

I have an Visual Studio 2005 WinForms application in which I have a
main form with a NavBar on the left, a menu and toolbar at the top, and
a working area panel on the right. Depending on which link on the
NavBar the user clicks on, I show the corresponding User Control in the
working area panel on the main form (make the panel the User Control's
parent).

What I want to do is this...If the user attempts to click on another
item in the NavBar, to try to go to another User Control, I want to
first execute code to make sure that all is well with data entered on
the control they're going to be "leaving". If it's not, I want to show
a message and keep them on the current control. If all is well, I let
things go. How can I implement this? Is there an event that I can use
for this? Just FYI, at this time, I simply make the control invisible
(after it's initially loaded the first time) when moving to another
control. I know there's a VisibleChanged event, but I'm thinking that's
not the place.

Also, how 'bout when the user attempts to exit the application. Is
there a nice way to do the same thing before allowing the application
to close (i.e. make sure all is cool on the current control?
 
What I want to do is this...If the user attempts to click on another
item in the NavBar, to try to go to another User Control, I want to
first execute code to make sure that all is well with data entered on
the control they're going to be "leaving". If it's not, I want to show
a message and keep them on the current control. If all is well, I let
things go. How can I implement this? Is there an event that I can use
for this? Just FYI, at this time, I simply make the control invisible
(after it's initially loaded the first time) when moving to another
control. I know there's a VisibleChanged event, but I'm thinking that's
not the place.
Click to expand...

Try out the Leave event.
Also, how 'bout when the user attempts to exit the application. Is
there a nice way to do the same thing before allowing the application
to close (i.e. make sure all is cool on the current control?
Click to expand...

Try out the Form_Closing event.
 
FUnky said:
Try out the Leave event.
Click to expand...

I'll look into that, though I think I tried that...
Try out the Form_Closing event.
Click to expand...

I can't run the code at the Main form level...must run in some event of
the user control. Unfortunately, there's no Control_Closing event, so
don't know which one to use.
 
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