DataGrid 增加一列全选

 function SelectAll(tempControl) {
 //将除头模板中的其它所有的CheckBox取反

var dt = document.all.<%=dgdFileList.ClientID%>;

for(var i = 1; i < dt.rows.length; i++) {

 var checkb = dt.rows(i).cells(0).childNodes(0);

  if(tempControl.checked)

  checkb.checked= true;

  else checkb.checked= false;

}

 }

DataGrid:

  <asp:TemplateColumn HeaderStyle-Width="10px">
            <HeaderTemplate>
             <asp:CheckBox id="chkHeader" runat="server" AutoPostBack="False" onclick="javascript:SelectAll(this);"></asp:CheckBox>
            </HeaderTemplate>
            <ItemTemplate>
             <asp:CheckBox id="chkItem" runat="server"></asp:CheckBox>
            </ItemTemplate>
           </asp:TemplateColumn>