I know I have done this before but I can\'t seem to remember where or how.
I want to create a link to an Item in Sitecore. This code:
Sitecore.Data.Items
You're needing this one, assuming you're running Sitecore v6 or anything more recent (tested with 8.2-6, should work with 9 too):
Sitecore.Links.LinkManager.GetItemUrl(item);