WPF Contact Book - Part 5 [Data Service]

Описание: In this video we setup our BookView and view model. All code and references can be found in the links below.

BookView - https://pastebin.com/dxmW0ti7
BookViewModel - https://pastebin.com/4w5QEuwu
IContactDataService - https://pastebin.com/8ftk1fK1
MockDataService - https://pastebin.com/4pFN4RSX

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