DmsManager.cs

 public class DmsManager : IDmsManager
    {
        readonly Guid _searchPageEventGuid = Sitecore.Context.Database.GetItem("{0C179613-2073-41AB-992E-027D03D523BF}").ID.Guid;
        readonly Guid _downloadPageEventGuid = Sitecore.Context.Database.GetItem("{FA72E131-3CFD-481C-8E15-04496E9586DC}").ID.Guid;

        private ICurrentPageContext CurrentPage()
        {
            return Tracker.Current.Session.Interaction.CurrentPage;
        }

        public void RegisterSearchTerm(string searchterm, ID itemId)
        {
            if (searchterm != null)
            {
                if (Tracker.IsActive && Tracker.Current.Contact != null && Tracker.Current.Session != null)
                {
                    var page = CurrentPage();

                    page.Register(new PageEventData("Search", _searchPageEventGuid) { ItemId = itemId.ToGuid(), Data = searchterm, DataKey = searchterm, Text = searchterm });
                }
            }
        }

        public void RegisterDownload(string downloadedResourceText, ID itemId)
        {
            if (downloadedResourceText != null)
            {
                if (Tracker.IsActive && Tracker.Current.Contact != null && Tracker.Current.Session != null)
                {
                    var page = CurrentPage();

                    page.Register(new PageEventData("Download", _downloadPageEventGuid) { ItemId = itemId.ToGuid(), Data = downloadedResourceText, DataKey = downloadedResourceText, Text = "Resource Downloaded" });
                }
            }
        }
    }