public void LoadDanhMucDocGia() { var docGia_BUS = new DocGia_BUS(); cbxLoaiDG.DisplayMember = "TenLoaiDocGia"; cbxLoaiDG.ValueMember = "MaLoaiDocGia"; cbxLoaiDG.DataSource = docGia_BUS.LoadComBoBoxLoaiDocGia("DocGiaLoai").Tables[0]; }