protected void grvLoaiHD_InsertCommand(object sender, GridCommandEventArgs e)
{
GridEditableItem item = e.Item as GridEditableItem;
Hashtable values = new Hashtable();
item.ExtractValues(values);
LoaiHopDong obj = new LoaiHopDong();
obj.NgayTao = obj.NgayCapNhat = DateTime.Now;
obj.NguoiTao = obj.NguoiCapNhat = idNhanVien;
item.UpdateValues(obj);
_entities.AddToLoaiHopDongs(obj);
_entities.SaveChanges();
}