This is sample about GoogleMap control properties' values and changes persited back to server during postbacks. To see the result of this demo, just drag the map to new location or change the zoom level. The "Submit" button fires just a postback to server after which you can see the position and zoom persisted. The "Save" button fires postback to server and saves position and zoom of the map to session, as well. The "Restore" button fires postback to server and restores the last saved in session position and zoom.