<asp:GridView ID="GridView1" runat="server" OnDataBinding="GridView1_DataBinding" AutoGenerateColumns="false">
        <Columns>
        <asp:TemplateField HeaderText="列" >
            <ItemTemplate>
            <asp:Label Text='<%# DataBinder.Eval(Container.DataItem, "列").ToString().Trim().Length > 10 ?DataBinder.Eval(Container.DataItem, "列").ToString().Trim().Substring(0,10) : DataBinder.Eval(Container.DataItem, "列").ToString().Trim() %>' runat="server"/>
            </ItemTemplate>
        </asp:TemplateField>
        </Columns>
        </asp:GridView>