There is an event of .FormClosing.
Attach your method to that.
- Open the form in Designer.
- On the Properties pallet click the events button (yellow lightening bolt)
- Scroll down to FormClosing
- Double-Click in the field to the right. A method stub will be created for you and an event handler will be created.
- Put your message in that method
- private void Form1_FormClosing(object sender, FormClosingEventArgs e)
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{
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System.Windows.Forms.DialogResult result = MessageBox.Show("Are you sure", "Close?", MessageBoxButtons.YesNo,
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MessageBoxIcon.Question);
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if (result == System.Windows.Forms.DialogResult.No) e.Cancel = true; // Cancel the close
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}
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