private void btnKhuyenMai_Click(object sender, EventArgs e) { if (this.ActiveMdiChild != null) { this.ActiveMdiChild.Close(); } QuanLy.frmKhuyenMai frm = new QuanLy.frmKhuyenMai(); frm.MdiParent = this; frm.Show(); }
private void btnKhuyenMai_Click(object sender, EventArgs e) { if (this.ActiveMdiChild != null) this.ActiveMdiChild.Close(); QuanLy.frmKhuyenMai frm = new QuanLy.frmKhuyenMai(); frm.MdiParent = this; frm.Show(); }