private void frmPhieuThuePhong_Load(object sender, EventArgs e)
        {
            txtMaPhong.Text   = room;
            txtLoaiPhong.Text = roomtype;

            cmbLoaiKhachHang.DataSource    = CustomerBUS.LayDSLoaiKhach();
            cmbLoaiKhachHang.ValueMember   = "MaLoaiKhach";
            cmbLoaiKhachHang.DisplayMember = "LoaiKhach";


            #region
            List <ParameDTO> lstMaxCus = RoomBUS.SoLuongKhachToiDa();
            maxCus = lstMaxCus[0].SLKhachToiDa;
            #endregion
        }
        private void SuKienLoadForm()
        {
            txtTenKhachHang.Text = "";
            txtDiaChi.Text       = "";
            txtCMND.Text         = "";
            List <KhachHangDTO> lst = CustomerBUS.LayDSLoaiKhach();

            cmbLoaiKhach.Items.Clear();
            for (int i = 0; i < (lst.Count); i++)
            {
                cmbLoaiKhach.Items.Add(lst[i].LoaiKhach);
            }
            cmbPhong.DisplayMember         = "MaPhong";
            cmbPhong.ValueMember           = "MaPhong";
            cmbPhong.DataSource            = RoomBUS.DanhSachPhongDangDuocThue();
            gcDanhSachKhachHang.DataSource = CustomerBUS.DanhSachKhachHang();
        }