How can I make dynamic loading of images?

How can I make dynamic loading of images?

-- xaml
<Image Source="{Binding Path=Img}"/>

-- CS
protected readonly AbstractProperty _imgProperty = new WProperty(typeof(object), null);

public AbstractProperty ImgProperty
{
get { return _imgProperty; }
}



public object Img
{
get { return (object)_imgProperty .GetValue(); }
set { _imgProperty.SetValue(value); }
}

Give an example from the gallery of pictures.

 

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I get a lot of images over the Internet.
I do not understand how to realize code?

 

I get different images with different sizes, and I display in <Image/>.
How can this be done?

 

I'm more interested in how to works MediaPortal.UI.SkinEngine.ContentManagement.ContentManager
the class. And why ContentManager.Instance.GetTexture (img.GetBuffer (), "temp.png");
when adding images to ContentManager then does not work
AvatarImage = "temp.png"; display the new image.