Sorting Sitecore Items by Popularity using xDB

ViewPageEventProcessor.cs

using System;
using Sitecore.Analytics;
using Sitecore.Diagnostics;
using Sitecore.Pipelines;
using Website.Logic.Common.Extensions;
using Sitecore.Data;
using Newtonsoft.Json;

namespace Website.Logic.Analytics.Views
{
    public class ViewPageEventProcessor
    {
        public void Process(PipelineArgs args)
        {
            Assert.ArgumentNotNull(args, "args");
            Assert.IsNotNull(Tracker.Current, "Tracker.Current is not initialized");
            Assert.IsNotNull(Tracker.Current.Session, "Tracker.Current.Session is not initialized");
            Assert.IsNotNull(Tracker.Current.Session.Interaction, "Tracker.Current.Session.Interaction is not initialized");
            if (Tracker.Current.Session.Interaction == null)
                return;
            var currentPage = Tracker.Current.CurrentPage;
            if (currentPage == null || currentPage.IsCancelled)
                return;

            var pageEventData = currentPage.Register(new Sitecore.Analytics.Data.PageEventData("View")
            {
                ItemId = item.ID.ToGuid(),
                Text = string.Format("Template ID: {0}", item.TemplateID),
                DataKey = item.TemplateID.ToString(),
                Data = item.TemplateID.ToString()
            });
        }
    }
}

Hi, I've just been reading your blog post and tried to implement as your instructions but I cannot find where "item" used in the block on line 26 is supposed to be declared?