Winform Alt F4 exit YesNo dialog

Song Lee

Hello, I want to add in a feature.

When exit button is clicked, it'll give Yes or No option.

If Yes, application closes, if No, nothing happens.

I have no problem with the coding below when it comes to "Click",

but when I press "Alt F4", program closes even if I click "No"

private void exitButton_Click(object sender, EventArgs e)

{

while(MessageBox.Show("Exit app?","Exit message",MessageBoxButtons.YesNo) == DialogResult.Yes)

{

this.Close();

}

//If "No", MessageBox closes

}

//////////////////////////////////////////////////////////////////////////////////

private void MainForm_KeyDown(object sender, KeyEventArgs e)

{

if (e.Alt && e.KeyCode == Keys.F4)

{

exitButton_Click(null, null);

}

2 Replies

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Ranjit Powar12y ago
Accepted answer
Hey, dont use keydown event just add below method in your code it will work.

protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
if (keyData == (Keys.Alt | Keys.F4))
{
if (MessageBox.Show("Exit app?", "Exit message", MessageBoxButtons.YesNo) == DialogResult.Yes)
{
this.Close();
}
else
{
return true;
}
}
return base.ProcessCmdKey(ref msg, keyData);
}
Song Lee12y ago
looked a bit complicated for me to understand, but it worked! XD
thank you