Caption的用途？该怎么处理

            DataTable dt = new DataTable();             dt.TableName = "内存表";//获取或设置表的名称                    DataColumn datac = new DataColumn();                    datac.Caption = "第一列";//获取或设置列的标题                    datac.ColumnName = "no1";                    DataColumn data2 = new DataColumn();                    data2.Caption = "第二列";                    data2.ColumnName = "no2";                    DataColumn datal = new DataColumn();                    datal.Caption = "第三列";                    datal.ColumnName = "no3";                    DataColumn[] cls=new DataColumn[3];                    cls[0] = datac;                    cls[1] = data2;                    cls[2] = datal;                    dt.Columns.AddRange(cls);                    DataRow row1 = dt.NewRow();//使用该方法来生成行对象                    row1[0] = "2000";                    row1[1] = "2003";                    row1[2] = "6003";                    dt.Rows.Add(row1);                    dt.AcceptChanges();//接受表的修改                    this.GridView1.DataSource = dt;                    this.GridView1.DataBind();

        <asp:GridView ID="GridView1" runat="server">        </asp:GridView>