Write Server Applications In ASP.NET And Visual Basic?

I am looking into writing a web-based vehicle tracking system. The framework I have in mind looks something like this:

Client application --- Database --- Database updater.

Client application: This would query the database for information and then display this information on a map.

Database: holds vehicle information such as speed, location, payload etc.

Database update: This application would need to continually check for information received from vehicles and then add that to the database.

I am confident that with my current skill set and some research and learning, I could write the client application and interface it to a database. However, I am at a loss as to how to write the database updater. Presumably, this would be an application running continually on the server, waiting for information to be received from vehicles and updating the database. Is this something I can do with ASP.NET and Visual Basic? Or would this require a different way of thinking than writing web pages?