The GCSettings class has a new LatencyMode property that you can use to adjust the time that the garbage collector intrudes in your application. You set this property to one of the values of the new GCLatencyMode enumeration.

The GC class has a new Collect(Int32, GCCollectionMode) method overload that you can use to adjust the behavior for a forced garbage collection. For example, you can use this overload to specify that the garbage collector should determine whether the current time is optimal to reclaim objects. This overload takes a value from the new GCCollectionMode enumeration

Now Ajax class integrated with .net famework.

Listview, A new control with Paging DataPager, a efficient control to play with huge number of data on web page, Just take a look here what i mean.

LINQ (Language Integrated Query)
LINQ adds native data querying capability to C# and VB.NET along with the compiler and Intellisense support. LINQ is a component of .NET 3.5. LINQ defines operators that allow you to code your query in a consistent manner over databases, objects and XML. The ASP.NET LinqDataSource control allows you to use LINQ to filter, order and group data before binding to the List controls.

We need to add 3 .dlls for LINQ implementation.

System.Core.dll - Includes the implementation for LINQ to Objects
System.Data.Linq.dll - Includes the implementation for LINQ to SQL
System.Xml.Linq.dll - Includes the implementation for LINQ to XML
See LINQ Implementation sample

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