Can You Support Me About Images Windows Application?

Question

 Hello,
I am doing a project about contact. I want show images avatar of user? But I cannot show images format "C:\Users\USERNAME\Pictures\images.jpg"
I have tried:

BitmapImage bim = new BitmapImage(new Uri(@ "C:\Users\USERNAME\Pictures\images.jpg"));

ImgAvatar.Source = bim;

But It isn't activity. Can you support I show images like it. or auto copy images this link to Assets in Project?
Thanks you so much !