Do you Short Messenger Service or Systems Management Server. I'll assume
you mean text messages.
Net has no native support for SMS, although .NET CE has some classes to
assist but every example I've seen requires you to tap into unmanaged code
in your solution. Something like nowSMS has a simple http based interface,
so if you have a hard wired mobile phone or GSM device attached to a PC its
simple to interface with it for inbound and outbound SMS traffic.
The easiest solution by far is to use one of the thousands of web based
services and access them from a web or desktop app if all you want to do is
send SMS messages out.