Diffrence Between Asp and Asp.net

ASP.NET has better language support, a large set of new controls and XML based components, and better user authentication.
ASP.NET provides increased performance by running compiled code.

ASP.NET code is not fully backward compatible with ASP.

New in ASP.NET
Better language support
Programmable controls
Event-driven programming
XML-based components
User authentication, with accounts and roles
Higher scalability
Increased performance - Compiled code
Easier configuration and deployment
Not fully ASP compatible