private void but_HoaDon_Click(object sender, EventArgs e)
        {
            frmHoaDon frmdg = new frmHoaDon();

            frmdg.ShowDialog();
            frmdg.Close();
            frmdg.Dispose();
        }
Esempio n. 2
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 private void but_HoaDon_Click(object sender, EventArgs e)
 {
     frmHoaDon frmdg = new frmHoaDon();
     frmdg.ShowDialog();
 }