C# coding for sending sms

Question

Hi,
I am looking for a c#, vs2005 code for my windows application which can send SMS message through a free service. Code will be used in applications on www.motiont.com. It has to work without any third party dlls, and must use some free service.

  And the application is a simple c# windows application which will take phone number and a message and send a sms message through it.

this is very urgent...!!!!
can anyone help me to do this.........?I just need the code....

Thanks....