How to remove/disable the form's close (X) button?

[ohadasor]

Hello,

I have an MDI child, which I need to be opened as long as the mainframe
is opened. The problem is that the user can close it using the X button
in the form's top-right edge.

How can I make this button disappear, or at least disabled?

I'm using C# with .NET Framework 2.0.

Thanks a lot!

[Bob Powell [MVP]]

Just off the top of my head....

Override the WndProc so that you can trap the WM_NCHITTEST and WM_NCPAINT
messages.

Paint your own title bar without the close button in the handler for
WM_NCPAINT

Prevent the detection of the close button in the WM_NCHITTEST.

--
Bob Powell [MVP]
Visual C#, System.Drawing

Ramuseco Limited .NET consulting
http://www.ramuseco.com

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<oh******@netvision.net.il> wrote in message
news:11**********************@i40g2000cwc.googlegr oups.com...

Hello,

I have an MDI child, which I need to be opened as long as the mainframe
is opened. The problem is that the user can close it using the X button
in the form's top-right edge.

How can I make this button disappear, or at least disabled?

I'm using C# with .NET Framework 2.0.

Thanks a lot!

[Lebesgue]

If you don't need the other icons from control box (minimize, maximize), you
can set the ControlBox property to false.
You can also override the Closing event of your form and cancel it (look at
closing reason and set e.Cancel = true;), which will not disable or let
disappear the button, but will not let anyone to close the form.

<oh******@netvision.net.il> wrote in message
news:11**********************@i40g2000cwc.googlegr oups.com...

Hello,

I have an MDI child, which I need to be opened as long as the mainframe
is opened. The problem is that the user can close it using the X button
in the form's top-right edge.

How can I make this button disappear, or at least disabled?

I'm using C# with .NET Framework 2.0.

Thanks a lot!