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MSDN Library

The  MSDN Library is a collection of official technical documentation content intended for developers developing for Microsoft products. The  MSDN Library documents the APIs that ship with Microsoft products and also includes sample code, technical articles and other programming information. Popular topics include: 
.NET Framework Class Library 

API and schema references for Windows Azure  

Windows API reference for Windows Store apps  

Windows Phone API reference  

Code Samples

Download code samples and applications for Windows 8, Windows Phone, Windows Azure, Office, SharePoint, Silverlight and other products. You can also explore the Official Visual Studio C#, VB.NET, and 101 LINQ samples. New samples are added frequently in JavaScript, C++, C#, Visual Basic, and F#.