How do I get the code for my radio in my car

Hi Rhonda
This can be hard especially if you do not have original paperwork with car, the only way to do this is through the Mercedes dealership as they should have a record as to what the code should be or they will have a way of resetting it, however i would advise NOT to guess the code at least not more than 3 times, as the older coded radios had a chip in them that blows if a code has been entered wrongly 3 times and makes the radio unusable to a thief sorry this isnt much help.