public int updateHeThong(HeThongDTO htDTO)
        {
            try
            {
                var querry = (from ht in htDataContext.hethongs
                              where ht.manhanvien == htDTO.Manhanvien
                              select ht).FirstOrDefault <hethong>();
                //querry.username = htDTO.Username;
                querry.password = htDTO.Password;
                htDataContext.SubmitChanges();
                return(1);
            }
            catch
            {
                return(0);
            }

            /* try
             * {
             *   htDataContext.Connection.Open();
             *   System.Data.Common.DbTransaction transaction = htDataContext.Connection.BeginTransaction();
             *   htDataContext.Transaction = transaction;
             *
             *   deleteHeThong(htDTO.Manhanvien);
             *   insertHeThong(htDTO);
             *
             *  htDataContext.Transaction.Commit();
             *   return 1;
             * }
             * catch(Exception)
             * {
             *   htDataContext.Transaction.Rollback();
             *   return 0;
             * }*/
        }
 public int insertHeThong(HeThongDTO htDTO)
 {
     try
     {
         hethong ht = new hethong();
         ht.username   = htDTO.Username;
         ht.manhanvien = htDTO.Manhanvien;
         ht.password   = htDTO.Password;
         htDataContext.hethongs.InsertOnSubmit(ht);
         htDataContext.SubmitChanges();
         return(1);
     }
     catch
     {
         return(0);
     }
 }
        public int updateHeThong(HeThongDTO htDTO)
        {
            try
            {
                var querry = (from ht in htDataContext.hethongs
                              where ht.manhanvien == htDTO.Manhanvien
                              select ht).FirstOrDefault<hethong>();
                //querry.username = htDTO.Username;
                querry.password = htDTO.Password;
                htDataContext.SubmitChanges();
                return 1;
            }
            catch
            {
                return 0;
            }
            /* try
             {
                 htDataContext.Connection.Open();
                 System.Data.Common.DbTransaction transaction = htDataContext.Connection.BeginTransaction();
                 htDataContext.Transaction = transaction;

                 deleteHeThong(htDTO.Manhanvien);
                 insertHeThong(htDTO);

                htDataContext.Transaction.Commit();
                 return 1;
            }
            catch(Exception)
            {
                 htDataContext.Transaction.Rollback();
                 return 0;
            }*/
        }
 public int insertHeThong(HeThongDTO htDTO)
 {
     try
     {
         hethong ht = new hethong();
         ht.username = htDTO.Username;
         ht.manhanvien = htDTO.Manhanvien;
         ht.password = htDTO.Password;
         htDataContext.hethongs.InsertOnSubmit(ht);
         htDataContext.SubmitChanges();
         return 1;
     }
     catch
     {
         return 0;
     }
 }