private void Form1_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
if(MessageBox.Show(this,"dd","dd", MessageBoxButtons.YesNoCancel )!= DialogResult.Yes )
e.Cancel=true;
}
{
if(MessageBox.Show(this,"dd","dd", MessageBoxButtons.YesNoCancel )!= DialogResult.Yes )
e.Cancel=true;
}
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