Support for LINQ Code Library:

C# 2.0 introduced the use of anonymous methods, and in C# 3.5  lambda expressions advanced anonymous methods as the preferred way to write inline code. Below is an example of queirying an XML file.

var xmlLinq = from m in XElement.Load (MapPath("emp.xml")). Elements("emp") select m;

LINQ can be denoted as a "Bullet Train" for data processing, and it is one of the best unorthodox tools that render a considerable flexibility to retrieve data from various sources. Considering it's use and functionality, LINQ can be considered as Microsoft's SQLLite with added maneuvering power. 

Support for ADO.Net, with SQL Server 2005, 2008 , Express and compact version.