In this article, I give you an example of how you can send SMS messages to wireless devices from C# .NET. I assume, that you are familiar with Visual Studio 2003 or 2005 and the basics of databases and the SQL language. The solution described here is an in-house solution. To use it, you need a GSM Modem for sending SMS messages.
The system architecture used for SMS messaging consists of a GSM Modem, that is attached to the PC with a phone-to-PC datacable, an SQL-SMS Gateway software installed onto your PC, an SQL database server, such as SQL Express or Microsoft SQL and your SMS application (Figure 1). As you can see in the figure, your SMS application will create an SQL record in the database. The SMS gateway will poll this record using an SQL SELECT statement and will send it using a GSM modem.
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