Closing MDI Parent form

[kumar_1981]

Hai

i am working with MDI forms. i am having parent form (mainfrm). and child forms(chld1,chl2)


from mainfrm i opened chld1 using

chld1.show();


now if i close parent form (mainfrm) the child windows r getting closed. i should restrict user to close parent form when child form is opened.

for that i am trying to use

chld.ShowDialog();

But unable to do that


Please help me in this regard


Thanks and Regards
VInay Kumar

[jmcilhinney]

An MDI child form cannot be a modal dialogue. To prevent the parent form closing you can handle the FormClosing event:

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
    // Cancel the closing action if and only if there are child forms.
    e.Cancel = (this.MdiChildren > 0);
}

Note that this assumes that you're using VB2005. In previous versions you'd handle the Closing event instead. Please make sure you specify your version in future.

Also, this will prevent Windows shutting down if your app has child forms open. You'd have to make a special case for if the system was shutting down. I don't know exactly how to do that because I've never had to myself but I know that the appropriate code has been posted before.

[kumar_1981]

Thats a great reply. Thank u so much


Just one more doubt added to it.


i am having parent form(mainfrm)

i am having 2 child forms(frm1,frm2)

i will go to frm1 and frm2 through mainfrm

if frm1 or frm2 is open, i should not able to select mainfrm


like frm1.ShowDialog();
but if i am using this in MDI i am getting error

Can i get answer for this one too.


Thank u so much in Advance

Regards
Vinay Kumar