private void Load_CBLoaiPhong()
{
LoaiPhongBUS data = new LoaiPhongBUS();
var loaiphong = data.GetLoaiPhongDA();
cbLoaiPhong.ValueMember = "MaLoaiPhong";
cbLoaiPhong.DisplayMember = "TenLoaiPhong";
cbLoaiPhong.DataSource = loaiphong;
}