In case if asp.net new controlls are used like 
datagrid,dataset etc
In case of asp.net there is html code also for each control
where in asp not.

In asp.net ,separation of presentation and design logic(code
behind).

code is structured

if you want  to create a control,for example label or text
box  it takes simple coding.

These features are not available on asp

Microsoft's previous server side scripting technology ASP
(Active Server Pages) is now often called classic ASP. 
ASP 3.0 was the last version of the classic ASP.

ASP.NET is the next generation ASP, but it's not an upgraded
version of ASP. 
ASP.NET is an entirely new technology for server-side
scripting. It was written from the ground up and is not
backward compatible with classic ASP.

Differences 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 
        Ready Validators for validation even with custom
validator to let prgrmr write validation code on his own coding
________________________________________

Dot net is Platform independant,Language Neutral,Supports 
Window based and web based applications

Asp is not as above