private void SuKienLoadForm()
{
txtTenKhachHang.Text = "";
txtDiaChi.Text = "";
txtCMND.Text = "";
List <KhachHangDTO> lst = KhachHangBUS.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 = PhongBUS.DanhSachPhongDangDuocThue();
gcDanhSachKhachHang.DataSource = KhachHangBUS.DanhSachKhachHang();
}