public void loadControl() { DataTable dtHangHoa = new DataTable(); dtHangHoa = hbus.ShowHang(); dgvhang.DataSource = dtHangHoa; DataTable dt1 = new DataTable(); dt1 = hbus.ShowHangloaihang(); cboMaLoai.DisplayMember = "MaLoai"; cboMaLoai.ValueMember = "TenLoai"; cboMaLoai.DataSource = dt1; DataTable dt2 = new DataTable(); dt2 = hbus.ShowHangnhacungcap(); cboMaNCC.DisplayMember = "MaNCC"; cboMaNCC.ValueMember = "TenNCC"; cboMaNCC.DataSource = dt2; }