asp.net has 
 more controls,
 user friendly,
 here we use two different page 
 one for design 
 other for logical coding
 so we can work simultaniously both on designing and coding

Both are serverside technologies which are used to develop 
a dynamic and interactive pages. But the main differences 
between them are 

asp is an interpretted code where as asp.net is a compiled 
code  and asp is a object based language ie it doesnt 
supports polymorphism and inheritance concept where as 
asp.net is a object oriented language .. (it supports)

In asp.net. There is of two pages ..one for designing and 
other for coding  so designer can do his work and developer 
can do his work at same time on same  application form.It 
results in better performance.. reducing time in devlopment 
of a file which is not possible for asp.

Asp doesn't suport oop's concepts 
Asp.Net Supports oop's concepts 

Asp maintance top to bottom coding 
Asp.Net doesn't maintain top to bottom coding 

Asp is not user friendly 
Asp.Net is user friendly

Asp code n html r at one isde 
Asp.Net html deffer frm general coding