public static frmTraCuuThongTin CreateInstance() { if (_singleton == null) { _singleton = new frmTraCuuThongTin(); } return(_singleton); }
private void buttonTraCuuTT_Click(object sender, EventArgs e) { frmTraCuuThongTin frm = frmTraCuuThongTin.CreateInstance(); clearTextBox(); clearTextBox(); frm.ShowDialog(); this.Show(); }