Adding DragNDrop feature give a brilliant look to our application.
People are used to it, and they (inconsciously) look for a better UX with day-by-day application.
Cristian Civera wrote a short (and easy to understand!!!) post on MSDN Tips & Tricks italian section.
Just three event (*_Click, *_DragEnter, *_Drop) and drag & drop is ready to use. 
source: Supportare il Drag&Drop nelle applicazioni WPF (lang:IT)
Technorati tags: Entity WPF
