How do I Disable Alt+F4 Key from closing my application

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VB

Hi everyone,

Please how do I disable the ALT + F4 Key from closing my application.

Thanks

Posted 14-Jul-11 5:10am

SamFad

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3 solutions

Solution 3

Best Ways to get key is

if (e.KeyCode == (Keys)115)
{
//ALT + F4 pressed
}

Posted 25-Sep-15 23:14pm

ankit2929

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Kim Togo · Accepted Answer · 2011-07-14T05:28:00

Solution 1

Handle Form.FormClosing[^] event and set e.Cancel = true. And perhaps check CloseReason[^] :-)

Posted 14-Jul-11 5:28am

Kim Togo

Updated 14-Jul-11 5:29am

v2

Comments

Reiss 14-Jul-11 11:43am

This will stop the form from closing in all cases and the CloseReason will only tell you UserClosing and not give any details about the whether it was invoked via the ALT-F4 key stroke combination.

Kim Togo 14-Jul-11 13:45pm

And CloseReason.UserClosing says:
"The user is closing the form through the user interface (UI), for example by clicking the Close button on the form window, selecting Close from the window's control menu, or pressing ALT+F4."

Then it covers all "UserClosing" events.
If it is only the Alt+F4 you want to prevent. Then look at Solution 2

Sergey Alexandrovich Kryukov 14-Jul-11 15:02pm

So, what's the problem? It's not "only", this is all what needed. On can assign Cancel=true on some conditions.
--SA

Sergey Alexandrovich Kryukov 14-Jul-11 15:00pm

Absolutely, my 5.
And OP should not forget for conditions used to exit application when it is really needed. Among other things, Application.Exit can be used for unconditional exit.
--SA

Kim Togo 15-Jul-11 3:38am

Thanks SA.

SamFad 15-Jul-11 7:22am

Thanks for your contributions. It works and I'm very grateful.
Can you please assist in making the application to always show on top of every other application? I set the 'TopMost' property of the form to 'TRUE'. It works for most application but there is this typing tutor that always overshadow it. I'll be very grateful if u can assist in this.
Once again, I thank u all for your contributions and I'm very grateful

Kim Togo 16-Jul-11 11:38am

You are welcome.
And about "TopMost" question. MSDN says: A topmost form is a form that overlaps all the other (non-topmost) forms.

When there is more applications that has "TopMost", my guess is that the last application that calls "TopMost" IS the most "TopMost" application.

Reiss · Accepted Answer · 2011-07-14T05:48:00

This is in C#, but should be easy enough to alter.

It is a bit of a hack to be honest

Declare a member var on the form

private bool ALT_F4 = false;

Handle the form closing event

C#

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
  if (ALT_F4)
  {
    e.Cancel = true;
    return;
  }
}

Handle the key down event on the form

C#

private void Form1_KeyDown(object sender, KeyEventArgs e)
{
  ALT_F4 =(e.KeyCode.Equals(Keys.F4) && e.Alt == true) ;
}

For Code conversion

Convert C# to VB.NET[^]