Nullable<long> ActiveObjectID {get;}

{
    {
        if (FrameworkApplication.Panes.ActivePane is ITablePane tablePane)
        {
            var mapMember = tablePane.MapMember;
            //Get the active row's object ID from the table pane
            var oid = tablePane.ActiveObjectID;
            if (oid.HasValue && oid.Value != -1 && mapMember != null)
            {
                //Get the field of the active column
                var activeField = tablePane.ActiveColumn;
                QueuedTask.Run(() =>
                {
                    // TODO: Use core objects to retrieve record and get value
                });
            }
        }
    }
}