ListView
The ListView control is quiet flexible and contains features of the Gridview, Datagrid, Repeater and similar list controls available in ASP.NET 2.0. It provides the ability to insert, delete, page (using Data Pager), sort and edit data.
DataPager
DataPager provides paging support to the ListView control. DataPager gives you a consistent way of paging with the controls that support it.
3.LINQ
LINQ (Language Integrated Query) adds native data querying capability to C# and VB.NET along with the compiler and Intellisense support.
4.ASP.NET Merge Tool
ASP.NET 3.5 includes a new merge tool (aspnet_merge.exe). This tool lets you combine and manage assemblies created by aspnet_compiler.exe. This tool was available earlier as an add-on.
5.New Assemblies
System.Core.dll
System.Data.Linq.dll
System.Xml.Linq.dll
System.Data.DataSetExtensions.dll
System.Web.Extensions.dll