I LOST MY IGNITION KEY for a 2007 c230 AND I AM LEFT WITH JUST ONE. PLEASE I NEED I SPARE HOW I DO I ORDER TO GET ANOTHER ONE. THANKS

Likely a bad ignition tumbler, considering the key "sticking" in the start position.

Best bet is to hit the dealer and ask one of their service advisors if they've run into this problem before.

first replace the battery in your key and have a look if you have any additional key try by that key it may work if without right diagnose no one can find it's faulty key or electronic ignition switch, if not the fault in key possibly faulty steering lock or electronic ignition switch, in this case you have to get your car in to the Mercedes workshop for diagnose.

please check in your car below driver door handle you can see small read and green light fitted in it and also below boot open button at rear if the indicator light fitted your car must have DAS 2 key otherwise your car have only that small key If the car with DAS 2 you have to go to the Mercedes dealer to order new key they need some information from you 1 chassis no of your car 2 Identification of you copy of your driving license or passport,

Take it to a locksmith. It will typically cast you $100.

chipped key ,take papers toi dealer and they will order one then car has to be taken to dealers to be programmed

hi..
Many cars these days are equipped with an immobilizer. (you can find more information about the immobilizer in your owner's manual). The immobilizer allows the engine to run only if the correct key is used. If your car has an immobilizer, you probable see a "Security" or Key-shaped light coming on on the dashboard every time you turn the ignition ON. If this light is flashing when you turn the ignition ON, it could mean that there is some problem with an immobilizer or the system does not recognize the key. If the immobilizer doesn't recognize the key, the engine wold not start at all, or would start and then die in few seconds.
You can try a spare key, if it won't work, your dealer is the place to call. Sometimes, the key is just need to be reprogrammed. On some cars you can find the information how to reprogram the key in the owner's manual.

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if you don't have the key number or a spare key, you'll have to get a new ignition switch.

does it have a chip in the key ? if not any locksmith can make you one

this should work straight away, but i would first put the key in the ignition, and put the ignition on for 30 seconds to a minute, then start it up

you have to go to the mercedes dealer and give them the vin number for the car so they can order and new key.i think iy costs 40 to 80 for a new key