.net批量插入数据库,SqlBulkCopy方法

   /// <summary>
        /// 把数据插入LessonQuestion表
        /// </summary>
        /// <param name="lessontitle"></param>
        /// <param name="region"></param>
        public void InsertTable(int questionid,List<DE.Model.DE_LessonInfo> dless)
        {
            DataTable dtlessoninfo = new DataTable();
            dtlessoninfo.Columns.Add(new DataColumn("L_ID"));
            dtlessoninfo.Columns.Add(new DataColumn("Q_ID"));

                //遍历每一项，把各项加入表
                #region 批量插入数据到LessonInfo
            foreach (DE.Model.DE_LessonInfo ragion in dless)
                {
                    DataRow dr = dtlessoninfo.NewRow();
                    dr["L_ID"] = ragion.L_ID;
                    dr["Q_ID"] = questionid;
                    dtlessoninfo.Rows.Add(dr);
                }
                SqlConnection sq = new SqlConnection(DbHelperSQL.connectionString);
                using (sq)
                {
                    sq.Open();
                    SqlBulkCopy sbc = new SqlBulkCopy(sq);
                    sbc.ColumnMappings.Add("L_ID", "L_ID");
                    sbc.ColumnMappings.Add("Q_ID", "Q_ID");
                    sbc.DestinationTableName = "DE_LessonQuestion";
                    sbc.WriteToServer(dtlessoninfo);
                #endregion
                }
        }