List<Item> lstTrans = Job.Items.Where(x => x.CID == 2).ToList();

            foreach (Item value in lstTrans)
            {
             //do stuff
            } 

I use that to do stuff when needed. 

But I want to be able to compare items within the list. I want to be able to find identical Item Numbers then make comparisons when needed. 

e.g. if there are two Items with an Item number of 30, I want to then compare these two items to one another.  I know what I need to do.  I just want to know the easiest way to compare items in one list...