C# on alt + f4

//you have to import system.windows.forms package if you aren't using a form app

this.FormClosing -= new System.Windows.Forms.FormClosingEventHandler(this.Form1_FormClosing);
this.Close();

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

Source: stackoverflow.com

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