update gridview field without dataBind - asp.net

Question

i have a gridview that show comments. i want that if a person likes a comment, press a like button and i increse the sum of likes , but i do not want to connect to database and bind. i want do that using ajax. how can i do that?
here is my code:
<asp:UpdatePanel runat="server" id="UpdatePanel" >
<ContentTemplate>
<asp:GridView ID="grdCommentsForLoginnedUser"
runat="server"
AutoGenerateColumns="False"
Width="100%"
OnRowCommand="grdCommentsForLoginnedUser_RowCommand"
ViewStateMode="Inherit">
<Columns>
<asp:TemplateField >
<ItemTemplate>
<asp:HiddenField ID="hdnCommentID" runat="server"
Value='<%# Bind("CommentID") %>'/>
<table border="2" dir="rtl">
<tr>
<td rowspan="2" style="background-color: #6699FF" width="200px">
<asp:HyperLink ID="lnkCommenterName"
runat="server"
NavigateUrl='<%# Bind("CommenterProfile") %>'
Text='<%# Bind("CommenterName") %>' />
</td>
<td width="700px">
<br />
<asp:Label ID="lblCommentText" runat="server"
Text='<%# Bind("CommentText") %>' />
<br />
</td>
</tr>
<tr>
<td width="700px">
<asp:Label ID="lblPreviousAcceptOrNonAccept" runat="server"
Text='<%# Bind("PersonPreviousAcceptOrNonAccept") %>' />
<asp:LinkButton ID="lnkBtnRemovePreviousAcceptOrNonAccept"
runat="server"
Text='<%# Bind("RemovePersonPreviousAcceptOrNonAccept") %>'
CommandName="RemovePreviousAcceptOrNonAccept"
CommandArgument="<%# ((GridViewRow) Container).RowIndex %>" />
<br />
<asp:LinkButton ID="lnkBtnUpRate" runat="server" Text="Like"
Visible='<%# Bind("isLikeAndUnlikeButtonVisible") %>'
CommandName="LikeComment"
CommandArgument="<%# ((GridViewRow) Container).RowIndex %>" />
<br />sum of likes
<asp:Label ID="lblCommentLikes" runat="server"
Text='<%# Bind("CommentLikes") %>' />
</td>
</tr>
</table>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</ContentTemplate>
</asp:UpdatePanel>

Answer 1

Add a client side onClick javascript to each button. When clicked get the parent td tag and then getElementById("lblCommentLikes") to set the .innerText property of the "lblCommentLikes" span.
+(theTD.getElementById("lblCommentLikes").innerText)+=1;
or
+(theTD.getElementById("lblCommentLikes").innerText)-=1;
Tip: If you are using IE then press F12 to inspect the DOM of a running page