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How about searching google for "sms c#" or "sms c# cf" and see what happens. The .Net framework doesn't contain this facility, so its likely to be some kind of interop call.
But you can use your phone as a GSM modem I think (does Nokia provide serial cables and serial connection to phone anymore?). Open COM port and say something like:
AT+CMGS="recipient phone number"\r
Your message\z
This way you can send max 360 char messages. If you need longer messages (concatenated) you need to deal with the PDU mode which is real pain in the a*s.