Disabling the Close-Button temporarily

Question

I need to disable just the close button (minimize and maximize should be allowed) temporarily.

Every solution I\'ve tried disables all the buttons

Answer 1

You can't hide it, but you can disable it:

private const int CP_NOCLOSE_BUTTON = 0x200;
protected override CreateParams CreateParams
{
    get
    {
       CreateParams myCp = base.CreateParams;
       myCp.ClassStyle = myCp.ClassStyle | CP_NOCLOSE_BUTTON ;
       return myCp;
    }
}

Source: http://www.codeproject.com/Articles/20379/Disabling-Close-Button-on-Forms

If you absolutely need to hide it, the only way to do it is to create a borderless form, then draw your own minimize and maximize buttons. Here is an article on how to do this: http://www.codeproject.com/Articles/42223/Easy-Customize-Title-Bar

Before considering either of these solutions, you should maybe rethink why you need to do this. Depending on what you are trying to do, there is probably a much better way to present the UI to the user other than taking away the familiar 'X' close button.