datatable的手工构造过程

            //声明一个名称为default的datatable
            DataTable dt = new DataTable("default");
            //声明int类型的列id
            DataColumn dc = new DataColumn("id", typeof(int));
            //为Datatable增加一列
            dt.Columns.Add(dc);
            //声明int类型的列title
            dc = new DataColumn("title", typeof(string));
            //为Datatable增加一列
            dt.Columns.Add(dc);
            //声明int类型的列content
            dc = new DataColumn("content", typeof(string));
            //为Datatable增加一列
            dt.Columns.Add(dc);
            dc.AutoIncrement = true;

            //为Datatable增加一行
            DataRow dr = dt.NewRow();
            dr["id"] = 1;
            dr["title"] = "hao";
            dr["content"] = "content";
            dt.Rows.Add(dr);
            //为Datatable增加一行
            dr = dt.NewRow();
            dr["id"] = 1;
            dr["title"] = "hao";
            dr["content"] = "content";
            dt.Rows.Add(dr);