FormClosing event not working

Question

I would like to get a response from the user when X is selected to close the child form but instead the formclosing event just closes the form

Can anyone help? This is my code below:

private void Form2_FormClosing(object sender, FormClosingEventArgs e)
{
DialogResult responseDialogResult;

            if (isDirtyBoolean)
            {
                responseDialogResult = MessageBox.Show(
                    "The data on the form has changed. Do you want to save the contents of the form to a file?", "File Change",
                    MessageBoxButtons.YesNo, MessageBoxIcon.Question);
                if (responseDialogResult == DialogResult.Yes)
                {
                    saveToolStripMenuItem_Click(sender, new System.EventArgs());
                }

Vulpes · Answer

If the MessageBox is not appearing then isDirtyBoolean must be false. Incidentally you can tell whether the form is closing on account of user action (such as clicking the 'X' button) by testing if e.CloseReason == CloseReason.UserClosing. Although it may not be relevant here you can also cancel the closing of the form by setting e.Cancel to true.