private void LoadData()
        {
            DataTable dt = new DataTable();

            dt = bnBUS.LoadData();

            dgvData.DataSource = dt;
        }
        private void LoadCboThuoc()
        {
            ThuocBUS  bnBUS = new ThuocBUS();
            DataTable dt    = new DataTable();

            dt = bnBUS.LoadData();

            cboThuoc.DataSource    = dt;
            cboThuoc.DisplayMember = "TenThuoc";
            cboThuoc.ValueMember   = "ID";
        }