I am using MDIParent window form which contains menus, when I click on same menu again it open a new window. so how to stop this from reopening the window if it is already open? It should not display window form every time on click.
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I am using MDIParent window form which contains menus, when I click on same menu again it open a new window. so how to stop this from reopening the window if it is already open? It should not display window form every time on click.
2 ways:
Way 1, flags:
Keep a flag (or list of flags) for the open forms.
Each time you open the form (create a new() one) set the flag to “true”.
When the form closes, set the flag to false.
In the button’s click event, check the flag to see if the form is open before creating a new one.
Way 2, keep a reference:
Keep a reference in the main form to all the forms you’re using.
Initialize them as null when the forms aren’t open.
When you open a new form set the reference to it.
On the button’s click event check if the form’s reference is null before you create a new one.
I prefer the second way. It’s easier to control your resources when you have references to all your sub-forms.