I've the following code, it's supposed to check if a variable from a DataList, it's the same as a variable called mesActual,  

      <li id="Li1" class='<%#
(Convert.ToBoolean(Convert.ToString(Eval("Month")) ==Convert.ToString(mesActual))) ? "activa" : "no-activa"
%>'>
          
<asp:LinkButton ID="lnkbtn" runat="server"CommandName="Select" CommandArgument='<%#Eval("Month")%>'><%#Eval("Month")%></asp:LinkButton>
           <div class="btn"><span><asp:Label ID="lbltot"
runat="server"></asp:Label></span></div>
      </li>

On page load, it seems to work, first item is selected and assigned the class "activa", but when i click on the button, it reloads the page, i can see my variable "mesActual" changed, but the class of the li doesn't change.