closing winform

Can open a 2nd WinForm via the 1st main WinForm.

Created an association (ownership) between the 1st and newly opened 2nd WinForm

The scripting also checks to see if the WinForm has been opened already ... this works (appears too).

Issue is:  when closing the 2nd WinForm and then wanting to open it again I call the opening WinForm script again -- but I cannot reopen the WinForm (once closed) -- I suspect it has something to with the formBrowser  null  status.

How do I reset this parameter or get working correctly?
// WinForm #1
 
FormBrowser formBrowser;
 
 
if (formBrowser != null) return;
 
formBrowser = new FormBrowser { Owner = this };
formBrowser.Show();

Open in new window

amillyardAsked:
Who is Participating?
 
Carl TawnConnect With a Mentor Systems and Integration DeveloperCommented:
It won't. Closing the form will not nullify the variable that was pointing to it.

You are best to check for null, or if the form is Disposed:
        private void button1_Click(object sender, EventArgs e)
        {
            if (f == null || f.IsDisposed)
                f = new Form5();
 
            f.Show();
        }
 
        Form5 f = null;

Open in new window

0
 
angus_young_acdcCommented:
Have you put in a breakpoint to see if formBrowser is null?  
0
 
amillyardAuthor Commented:
angus_young_acdc:  checking the breakpoint ... null the 1st time called.  the 2nd onwards is not displayed as null, but is soft of empty !   when disposing the WinForm, it is not resetting back to null status
0
Introducing Cloud Class® training courses

Tech changes fast. You can learn faster. That’s why we’re bringing professional training courses to Experts Exchange. With a subscription, you can access all the Cloud Class® courses to expand your education, prep for certifications, and get top-notch instructions.

 
VikramMullickCommented:
try
formBrowser.Showdialog(this)
0
 
Éric MoreauConnect With a Mentor Senior .Net ConsultantCommented:
you should check for null or IsDisposed
0
 
amillyardAuthor Commented:
carl_tawn: & emoreau:  works great now :-)   many thanks.
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.