Databinding and Image to a url

I think there should be a really easy way to do this "Image" is a string url like http://www.something.com/images/hello.png
image.SetBinding(Image.SourceProperty, new Binding("Image"));

I'm trying to figure out how to get that image do display in a custom view cell and I think the issue is in how I'm setting up my binding. How should I be doing this?