Hi,
Here is the sequence...
GPS Device(s)------->TCP/UDP Listner------> DataBase ------> [DAL] ASP.Net WebPages.
You have to write TCP listner Serivce for this, where all your devices will connect and push data. Store the data in the Database. Create a web application on this database.
The Simplest TcpServer[
^]
Thanks
--RA