Control Validation & the Tab Control
Hi, I'm using VB.net and doing various validation on controls using the Validating event and setting the e.Cancel = true if the validation was unsuccessful.
This works fine on everything apart from when the user hits a tab on a tab control... its seems to fire the validating event 2/3 times but the tab still changes and an incorrect value is left stored in the control. Why should this happen, surely the tab control shouldn't receive the focus if I set e.cancel = true in the validating event...?
Any ideas?
This works fine on everything apart from when the user hits a tab on a tab control... its seems to fire the validating event 2/3 times but the tab still changes and an incorrect value is left stored in the control. Why should this happen, surely the tab control shouldn't receive the focus if I set e.cancel = true in the validating event...?
Any ideas?
Try sticking in
e.handled = true
somewhere in the code.
e.handled = true
somewhere in the code.
ASKER
Sorry...
I have a Textbox in which I'm doing some validation using the validating event. If the validation fails I set e.Cancel=true and the textbox does not lose the focus when clicking anywhere on the form.... except when clicking on a tab of a tab control...
Somehow the tab control seems to continue to work and switches pages, firing the validating event of the textbox a few times, but eventually losing the focus leaving an invalid value...
Does this make more sense?
I have a Textbox in which I'm doing some validation using the validating event. If the validation fails I set e.Cancel=true and the textbox does not lose the focus when clicking anywhere on the form.... except when clicking on a tab of a tab control...
Somehow the tab control seems to continue to work and switches pages, firing the validating event of the textbox a few times, but eventually losing the focus leaving an invalid value...
Does this make more sense?
Are you still having a problem with this?
ASKER
Yes I've still got the problem.
The validating event of a textbox doesn't seem to stop the tab control changing tabs... which is very annoying, any work around would be welcomed.
The validating event of a textbox doesn't seem to stop the tab control changing tabs... which is very annoying, any work around would be welcomed.
ASKER CERTIFIED SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
Did you get that last comment? Did you find a fix yourself?
ASKER
Thanks for your help it would appear that it was my problem, if you place sender.focus (I don't know why this was done....) in the validating event it causes the events I described above.
<< tab control shouldn't receive the focus if I set e.cancel = true in the validating event>>
The Validating event is when a control is about to lose focus.
The events occurs in this order:
Leave
Validating
Validated
LostFocus
So unless you are putting in e.Cancel=True in another control's Validating event, then the tab control will receive the focus.