The file extension .aspx is an improved version of ASP.net. This network uses a Common Language Runtime (CLR) established execution environment based on the .NET language platform.
ASP.net has improved its dynamic code programming by depending on the "code-behind" model that separates style and substance code for security and integrity purposes. Modifications can be made more easily without altering the original code.
This "code-behind" model allows for more concentrated code targeting functions. It also permits different developers to write code for either style or substance on a Web page, leading to an increased specialization and utilization of talents.