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Disable the Close box on a form

, 18 Feb 2012 CPOL 43.5K 15
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Disable the Close box on a form
If you want to prevent the user from closing your form until he has dealt with something really important, you can set
Form.ControlBox=false
but this also removes the Min, Max, and system menu from the form as well.
You cannot (it seems) remove just the Close box, but you can disable it, and it alone. To disable and grey out the Close box, override the CreateParms getter:
protected override CreateParams CreateParams
    {
        get
        {
            CreateParams parms = base.CreateParams;
            parms.ClassStyle |= 0x200;  // CS_NOCLOSE
            return parms;
        }
    }
WARNING:
  1. If you do this, all normal methods of closing the form become unavailable to the user. Use this only when it is really needed.
  2. Remember to provide some way to close the form (and test it!)

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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OriginalGriff
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Comments and Discussions

 
GeneralMy vote of 4 Pin
Sanjay K. Gupta1-Jun-12 18:34
memberSanjay K. Gupta1-Jun-12 18:34 
QuestionNice tip Pin
CIDev3-May-12 3:04
memberCIDev3-May-12 3:04 
This is a really handy tip; 5 from me. Smile | :)
Just because the code works, it doesn't mean that it is good code.

GeneralReason for my vote of 5 I found it helpful. Hence voted 5. Pin
ProEnggSoft24-Feb-12 18:50
memberProEnggSoft24-Feb-12 18:50 
GeneralThis is very helpfull. Thank you very much xD // Enable/Dis... Pin
Ben Pretorius4-Jul-11 22:41
memberBen Pretorius4-Jul-11 22:41 
GeneralReason for my vote of 5 I liked it. Found it helpful and wor... Pin
All Time Programming4-Jul-11 20:50
memberAll Time Programming4-Jul-11 20:50 
GeneralReason for my vote of 5 Good one i have used before works we... Pin
charles henington27-Jun-11 12:01
membercharles henington27-Jun-11 12:01 
GeneralHow to alternatively close the form after this? Or How to en... Pin
maxxon1517-Apr-11 5:33
membermaxxon1517-Apr-11 5:33 
GeneralRe: You can't AFAIK re-enable the button (the CreateParms getter... Pin
OriginalGriff17-Apr-11 21:09
mvpOriginalGriff17-Apr-11 21:09 
GeneralRe: You can't AFAIK re-enable the button (the CreateParms getter... Pin
CIDev3-May-12 3:03
memberCIDev3-May-12 3:03 

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