Programming Forums > Application Development > C#

Robocop · Jul 24th, 2007, 4:37 PM

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:

(Toggle Plain Text)

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

But I'm getting this error:

(Toggle Plain Text)

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

jaeusm · Jul 24th, 2007, 4:58 PM

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

crawforddavid2006 · Jul 24th, 2007, 5:03 PM

try something like this

 csharp Syntax (Toggle Plain Text) 
     frmSecondary frm = new frmSecondary();
     bool frmShow = false;
     if (frmShow == false)
     {
          frm.Show();
     }
     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, 5:39 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, 6:01 PM

Quote:

Originally Posted by john Wesley

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

john Wesley · Jul 25th, 2007, 8:04 AM

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

Jul 24th, 2007, 4:37 PM	#1
Robocop Programmer Join Date: Sep 2004 Posts: 47 Rep Power: 0	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: (Toggle Plain Text) frmSecondary frm = new frmSecondary(); if (frm.Shown == false) { frm.Show(); } frmSecondary frm = new frmSecondary(); if (frm.Shown == false) { frm.Show(); } But I'm getting this error: (Toggle Plain Text) Error 1 The event 'System.Windows.Forms.Form.Shown' can only appear on the left hand side of += or -= Error 1 The event 'System.Windows.Forms.Form.Shown' can only appear on the left hand side of += or -=

Jul 24th, 2007, 5:39 PM	#4
john Wesley Hobbyist Programmer Join Date: May 2006 Location: United Kingdom Posts: 119 Rep Power: 3	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. __________________ Mona Lisa must of had the highway blues you can tell by the way she smiles..

Jul 25th, 2007, 8:04 AM	#6
john Wesley Hobbyist Programmer Join Date: May 2006 Location: United Kingdom Posts: 119 Rep Power: 3	That one mistake could easily cause you headaches in the future - does you best to keep a sharp eye. __________________ Mona Lisa must of had the highway blues you can tell by the way she smiles..

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Jul 24th, 2007, 4:58 PM	#2
jaeusm Programmer Join Date: Feb 2006 Location: Columbus, OH Posts: 84 Rep Power: 3	'Shown' is an event, not a boolean value. You might want to consider the 'Visible' property.

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Programming Forums > Application Development > C#

Making the form open once