Size of an Image Control

Why don't you set the Stretch property of image to None? It will automatically make image control of the same size as image.

You could try this:

// load pic
Uri src = new Uri(@"/WpfPictureExport;component/Images/Chrysanthemum.jpg", UriKind.Relative);
BitmapImage img = new BitmapImage(src);
image2.Source = img;

// set the size of the control to picture
image2.Height = img.PixelHeight;
image2.Width = img.PixelWidth;