GridView怎么指定显示字段个数？多谢赐教

GridView如何指定显示字段个数？谢谢赐教！
GridView如何指定显示字段个数？谢谢赐教！

我写了如下代码，可是显示时老越界显示其他字段啊 

HTML code

<asp:GridView ID="GridView1" runat="server" Height="100%" Width="100%" CellPadding="4" ForeColor="#333333" GridLines="None" onrowdatabound="GridView1_RowDataBound">                             <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />                             <RowStyle BackColor="#EFF3FB" />                             <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />                             <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />                             <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />                             <EditRowStyle BackColor="#2461BF" />                             <AlternatingRowStyle BackColor="White" />                           <Columns>                             <asp:BoundField HeaderText="选种" DataField="ischeck" />                             <asp:BoundField HeaderText="项目编号" DataField="ItemNo" />                             <asp:BoundField HeaderText="项目名称" DataField="ItemName" />                             <asp:BoundField HeaderText="工时" DataField="SrvTimes" />                             <asp:BoundField HeaderText="单价" DataField="Price" />                                   <asp:BoundField HeaderText="系统类别" DataField="systemtype" />                             <asp:BoundField HeaderText="金额" DataField="Amount" />                             <asp:BoundField HeaderText="保养类别" DataField="bytypeno" />                           </Columns>                                                 </asp:GridView>