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private Image m_Image;
... 
BitmapImage img = new BitmapImage(new Uri("/MyResourcesAssembly;component/icons/myimage.png"));
m_Image = new System.Windows.Controls.Image();
m_Image.Source = img;
...					

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pack://application:,,,/MyResourcesAssembly;Component/icons/myimage.png					

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         Assembly asm = Assembly.LoadFile("Myresources.dll");
          BitmapImage bmp = new BitmapImage();
          bmp.BeginInit();
          bmp.StreamSource = asm.GetManifestResourceStream("Myresources.image.jpg");
          bmp.EndInit();
          m_Image = new System.Windows.Controls.Image();
          m_Image.Source = bmp;