I am using facebook C# sdk from codeplex and trying to download user\'s profile picture.
I know I can get this from:
http://graph.facebook.com/UID/picture?t
You don't actually need the second URL. The second URL is just a caching url. Just use the graph.facebook.com/username/picture?type=large url. The longer caching url could change so it is not a reliable source of the image anyway.