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Disable the Close box on a form

, 18 Feb 2012 CPOL 41.3K 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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Comments and Discussions

 
GeneralMy vote of 4 Pin
Sanjay K. Gupta1-Jun-12 19:34
memberSanjay K. Gupta1-Jun-12 19:34 

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