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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>