private void btnTim_Click(object sender, EventArgs e)
        {
            if (txtMaPhong.Text != "")
            {
                // Lấy dữ liệu
                TraCuuPhongDTO TCP_DTO = new TraCuuPhongDTO();
                TCP_DTO.StrMaPhong = txtMaPhong.Text;

                DataSet ds = TraCuuPhongBUS.TraCuuPhong(TCP_DTO);
                dgrvDanhSachPhong.Columns.Clear();
                dgrvDanhSachPhong.DataSource = ds.Tables[0];
                dgrvDanhSachPhong.Columns[0].HeaderText = "Mã Phòng";
                dgrvDanhSachPhong.Columns[1].HeaderText = "Loại Phòng";
                dgrvDanhSachPhong.Columns[2].HeaderText = "Đơn Giá";
                dgrvDanhSachPhong.Columns[3].HeaderText = "Tình Trạng";

                for (int i = 0; i < dgrvDanhSachPhong.Rows.Count - 1; i++)
                {
                    string strTT = dgrvDanhSachPhong.Rows[i].Cells[3].Value.ToString();
                    if (strTT == "0")
                        dgrvDanhSachPhong.Rows[i].Cells[3].Value = "Phòng trống";
                    else
                        if (strTT == "0")
                            dgrvDanhSachPhong.Rows[i].Cells[3].Value = "Phòng đã đặt";
                        else dgrvDanhSachPhong.Rows[i].Cells[3].Value = "Phòng đang sửa";
                }
            }
        }
 public static DataSet TraCuuPhong(TraCuuPhongDTO TCP_DTO)
 {
     SqlConnection con = DataProvider.ConnectionString();
     string strSQL = "select MaPhong, TenLP, GiaVN, TinhTrang from Phong, LoaiPhong where Phong.MaLP = LoaiPhong.MaLP and MaPhong = " + TCP_DTO.StrMaPhong;
     return DataProvider.GetDataSet(strSQL, con);
 }
 public static DataSet TraCuuPhong(TraCuuPhongDTO TCP_DTO)
 {
     return TraCuuPhongDAO.TraCuuPhong(TCP_DTO);
 }