public void EnableButton(DateTime data)
        {
            DataTable dt   = bll.getListTable(data);
            String    list = "";



            foreach (Button btn in splitContainer2.Panel1.Controls.OfType <Button>())
            {
                //MessageBox.Show("đã đi qua đây");
                btn.Enabled = true;
            }
            foreach (DataRow row in dt.Rows)
            {
                list = row["MaBan"].ToString()[row["MaBan"].ToString().Length - 1].ToString();

                foreach (Button btn in splitContainer2.Panel1.Controls.OfType <Button>())
                {
                    if (btn.Name == list)
                    {
                        btn.Enabled = false;
                    }
                }
            }
        }