C#
C# (pronounced as see sharp) is a mulch-paradigm programming language encompassing strong typing, imperative, declarative, functional, generic, object-oriented (class-based), and component-oriented programming disciplines.
Following are the books for C# . ( Downloadable )
(1)
Book Description
You want to learn C# programming, but you're not sure you want to suffer through another tedious technical book. You're in luck: Head First C# introduces this language in a fun, visual way. You'll quickly learn everything from creating your first program to learning sophisticated coding skills with C# 4.0, Visual Studio 2010 and .NET 4, while avoiding common errors that frustrate many students.
(2)

Professional C# 4.0 and .NET 4
Book Description
The new C# 4 language version is indispensable for writing code in Visual Studio 2010. This essential guide emphasizes that C# is the language of choice for your .NET 4 applications. The unparalleled author team of experts begins with a refresher of C# basics and quickly moves on to provide detailed coverage of all the recently added language and Framework features so that you can start writing Windows applications and ASP.NET web applications immediately.