ADO.NET 2.0 has new data binding model which reduce the 
amount of code you write for data binding. It has more 
compact dataset. ADO.NET 2.0 supports provider factories by 
which you can write generic data access code. SQL Server 
can now hast the CLR, also SQL notifications for ADO.NET 
2.0 is new concept. some ADO.NET properties specially for 
SQL Server 2005 like MARS (multiple active record set), 
user defined data types, managed stored procedure by which 
we can write S.P. in pure C#, snapshot transaction 
isolation by which we can see relatively older data while 
it is being updated by another transaction.