Programming Forums - Making the form open once

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- - Making the form open once (http://www.programmingforums.org/showthread.php?t=13616)

Robocop

Jul 24th, 2007 5:37 PM

Making the form open once

What I want to do is to make it so that if the form is already opened, it shouln't open again until it is closed... also I don't want to use ShowDialog().

I tried this:

     frmSecondary frm = new frmSecondary();

     if (frm.Shown == false)

     {

          frm.Show();

     }

But I'm getting this error:

Error        1        The event 'System.Windows.Forms.Form.Shown' can only appear on the left hand side of += or -=

jaeusm

Jul 24th, 2007 5:58 PM

'Shown' is an event, not a boolean value. You might want to consider the 'Visible' property.

crawforddavid2006

Jul 24th, 2007 6:03 PM

try something like this

     frmSecondary frm = new frmSecondary();
     bool frmShow = false;
     if (frmShow == false)
     {
          frm.Show();
     }

also, i didnt compile the code, i just typed it out so let me know if it doesnt work right

john Wesley

Jul 24th, 2007 6:39 PM

Of course it wont work 'right' - the condition will never result to true.

What I suggest you do is track the forms Load and Closing events, setting variables appropriately so that conditional statements have a non-futile use.

crawforddavid2006

Jul 24th, 2007 7:01 PM

Quote:

Originally Posted by john Wesley (Post 131089)

Of course it wont work 'right' - the condition will never result to true.

well i knew you needed an else statement, i just didnt know what he wanted in there. i make 1 mistake and everyone is all over it:rolleyes:

john Wesley

Jul 25th, 2007 9:04 AM

That one mistake could easily cause you headaches in the future - does you best to keep a sharp eye.

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