To avoid any misunderstanding I should say that RadMap doesn't save any data but just shows map shapes represented in one of the following formats: ESRI shape file, KML, WKT/WKB. So, it is on your own to create routines which will store map objects to database.
I have attached a sample solution which allows user to move items on the map.
I hope this gets you started.
Also I would recommend you to take a look at the following documentation topics:
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