In .net 2.0, no need to write excess code for the control 
function instead we can set the properties which are 
available directly on the control by right clicking the
control.
In .net 1.0, we need to write code for every of the 
property.
In .net 2.0,GridView control is added with advanced 
features.

Generics types are introduced in 2.0, Nullable data types
are introduced.IDE is changed drastically for dynamic help.

There are some new features in .Net2.0 are-
there are more then 40 types of new controls are added in
.net 2.0,
like Master page,
Navigation controls-tree view,
login coltrols
Virtul Class concepts
No need to create virtual directory

In .net 2.0 so many new features are added like:-
Master Pages, Theams & Skins, Advanced controls like Menu 
control, Datasource Controls,
and it provides enhancements towards Caching (disk caching, 
sql server cache invalidation),Profiles concept
Most Importantly "PARTIAL CLASSES"(even now code-behind is 
working based on this Partial Class only....
..............etc

exception handing, and ..