I have download some tile image files from google map and want to display them on the map, are there any sample codes can do this? thanks!

You could look at the MapTilerTileSource sample in mapsui:

http://mapsui.codeplex.com/SourceControl/changeset/view/72ad3a0a26d5#Mapsui.Wpf%2fWindow1.xaml.cs

But i really need to add more samples,  sorry about that.

Paul