UpdatePanel does not work in a web application

I have the following simple code:

<asp:UpdatePanel runat="server">
    <ContentTemplate>
    <asp:LinkButton runat="server" Text="Refresh"></asp:LinkButton>
    </ContentTemplate>
</asp:UpdatePanel>


<asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate>
    <asp:Label ID="LinkButton1" runat="server" Text="<%# DateTime.Now.ToString() %>"></asp:Label>
    </ContentTemplate>
</asp:UpdatePanel>

And in the master page there is a ToolkitScriptManager. but the update panel does not work never similar to t开发者_开发百科hey do not exist.

Note: I use .Net 4.0.

Edit: I removed the ToolKitScriptManager and added ScriptManager and the problem still exists. Seems the Ajax functionality is disabled in my application but I do not know how.

Any help!

can you post Code behind Code? I think you missed the databind method in code behind. Are you getting any errors?

I knew the problem.

<asp:LinkButton runat="server" Text="Refresh"></asp:LinkButton> must have an ID to do a partial postback to its Update Panel.