asp:Label does net keep value over postback
===

I have 3 CheckBoxLists, where a user can choose from certain criterias to get a list of all open jobs matching those.

The values of those 3 lists are parsed to 3 strings with the format "-999999,v1,v2,...,vn". Those are used in for querying the database to get a list with all available spots.

Now I am told to incorporate a simple label which is telling the user, how many jobs will be displayed once he hits "search"

This wasn't much of a problem since I incorporated the asp:Label in the UpdatePanel. It works fine until you click on a link, leave the site and then hit the BACK button.

The label always displays "0 matches found", whilst the checkboxes retain their status (checked/unchecked)  over the postback.

The relevant part of the code would be:

    foreach (DataRowView drvSql in dvSql)
    {
        lblStellencount.Text = drvSql["COUNT"].ToString() +" matches found.";
    }

Any ideas on how to make the text persitant over callbacks?
I've already tried putting the value in a Session variable without success.