First, we use .net & sql server.
I have a client that is interested in a system that will send SMS messages at scheduled times.
I have never done anything li
Easiest way is to use an SMS gateway who provide an API. Check out txtlocal
If you use a provider such as txtlocal you have 2 options - you can either build the scheduling into your system, or you could have a batch process which sends the sms info and the time that you want it to be sent using their API.