private void cboChoose_SelectedIndexChanged(object sender, EventArgs e) { if (cboChoose.SelectedIndex == -1) { return; } px.Search = cboChoose.Text; cboSearch.Items.Clear(); List <PhieuXuatHang> pxlist = pxbll.LocDanhSachPhieuXuatHang(px); if (cboChoose.Text == "Mã Phiếu Xuất") { cboSearch.Text = ""; foreach (PhieuXuatHang pxs in pxlist) { cboSearch.Items.Add(pxs.MaPx); } } else if (cboChoose.Text == "Mã Nhân Viên") { cboSearch.Text = ""; foreach (PhieuXuatHang pxs in pxlist) { cboSearch.Items.Add(pxs.MaNv); } } else if (cboChoose.Text == "Mã Sản Phẩm") { cboSearch.Text = ""; foreach (PhieuXuatHang pxs in pxlist) { cboSearch.Items.Add(pxs.MaSp); } } else if (cboChoose.Text == "Mã Khách Hàng") { cboSearch.Text = ""; foreach (PhieuXuatHang pxs in pxlist) { cboSearch.Items.Add(pxs.MaKh); } } else { return; } }