Hi,

Asp.net 2.0 features:

1.Master pages.

2..Profiles.

3..gridview control

Asp.net 3.5

1.listview conrtrol.

2.datapager control

3.netsted master pages

in c# some of features

partial methods,extenction methods,linq to sql etc

Thanks,

Narasima

MY Answer is asp2.0 does not support ajax,silver light,linq..etc

asp3.5 supports these  controls.

In asp2.0 desiging is easier then asp3.5.