gridview
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
                  BackColor="LightGoldenrodYellow" BorderColor="Tan" BorderWidth="1px" 
                  CellPadding="2" ForeColor="Black" GridLines="None" Width="733px" 
                  onrowdatabound="GridView1_RowDataBound" AllowPaging="True" 
                  onpageindexchanging="GridView1_PageIndexChanging" PageSize="5" 
                 >

               <AlternatingRowStyle BackColor="PaleGoldenrod" />

               <Columns>
               <asp:TemplateField>
                <ItemStyle HorizontalAlign="Center" />
                    <ItemTemplate>
                        <asp:CheckBox ID="chkSingle" runat="server" />
                    </ItemTemplate>
                    <HeaderTemplate>
                       选取
                    </HeaderTemplate>
               </asp:TemplateField>
                <asp:BoundField DataField="AD_EMPNO" HeaderText="工号"  
                       ItemStyle-HorizontalAlign="Center">
<ItemStyle HorizontalAlign="Center"></ItemStyle>