If I define the following template inside DetailsView, then upon clicking an Update or Insert button, the page is posted back to the server:

   <EditItemTemplate>
       <asp:TextBox ID="txtDate" runat="server" Text='<%# Bind("Date") %>'></asp:TextBox>
    <asp:CompareValidator ID="valDateType" runat="server" ControlToValidate="txtDate" Type="Date" Operator="DataTypeCheck" Display="Dynamic" >*</asp:CompareValidator> 
</EditItemTemplate>

If I remove CompareValidator control from the above code by simply deleting it, then page still gets posted back.But if instead I remove CompareValidator control by enclosing it within <!-- --> tags, then for some reason clicking an Update or Insert button doesn’t cause a postback...instead nothing happens:

   <EditItemTemplate>
       <asp:TextBox ID="txtDate" runat="server"   Text='<%# Bind("Date") %>'></asp:TextBox>
   <!-- <asp:CompareValidator ID="valDateType" runat="server" ControlToValidate="txtDate" Type="Date" Operator="DataTypeCheck" Display="Dynamic" >*</asp:CompareValidator> -->
</EditItemTemplate>
</EditItemTemplate>

Any idea why page doesn't get posted back?

thanx