<asp:TemplateField >               
                <ControlStyle Width="20px"  />
                 <HeaderTemplate> <!--注意这个HeaderTemplate,在这里加了两链接用于全选和反选-->   
                 <a onclick="DoCheck(0);" href="http://www.mamicode.com/#">反选</a> <!--反选--> 
                 <a onclick="DoCheck(1);" href="http://www.mamicode.com/#">全选</a> <!--全选-->                  
                </HeaderTemplate>
                <ItemTemplate>
                <div style="text-align:center ;">
                    <asp:CheckBox ID="CheckBox1" runat="server"/>
                </div>
                </ItemTemplate>
               
            </asp:TemplateField>

http://download.cnblogs.com/insus/ASPDOTNET/CheckBoxSelectedValue.zip

Giew与checkBox的结合