C# 3, or C# version 3.0, was released on November 06, 2006.
Here are select books about C# 3.
2007-09-00
C# 3.0 In A Nutshell
Edition: 1
Series: The Definitive Reference
Authors: Joseph Albahari and Ben Albahari
Publisher: O’Reilly
ISBN: 9780596527570
Type: Book
Format: Paperback
Price: US $50
On sale @ Amazon.
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2007-12-01
C# 3.0 Cookbook
Edition: 1
Series: Cookbook
Authors: Jay Hilyard and Stephen Teilhet
Publisher: O’Reilly
ISBN: 9780596516109
Type: Book
Format: Paperback
Price: US $55
On sale @ Amazon.
Shop @ O’Reilly.
2007-12-15
C# 3.0 Design Patterns
Edition: 1
Series: Design Patterns
Author: Judith Bishop
Publisher: O’Reilly
ISBN: 9780596527730
Type: Book
Format: Paperback
Price: US $50
On sale @ Amazon.
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2007-12-27
Programming C# 3.0
Edition: 1
Series: Programming
Authors: Ian Griffiths, Matthew Adams, and Jesse Liberty
Publisher: O’Reilly
ISBN: 9780596527433
Type: Book
Format: Paperback
Price: US $50
On sale @ Amazon.
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2008-02-01
C# 3.0
Edition: 1
Series: Pocket Reference
Authors: Joseph Albahari and Ben Albahari
Publisher: O’Reilly
ISBN: 9780596519223
Type: Book
Format: Paperback
Price: US $15
On sale @ Amazon.
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2008-04-21
C#
Edition: 1
Series: In Depth
Author: Jon Skeet
Publisher: Manning
ISBN: 9781933988368
Type: Book
Format: Paperback
Price: US $45
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2008-08-22
Essential C# 3.0
Edition: 2
Series: Microsoft .NET Development
Author: Mark Michaelis
Publisher: Pearson
ISBN: 9780132701594
Type: Book
Format: Paperback
Price: US $40
On sale @ Amazon.
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2008-10-08
The C# Programming Language
Edition: 3
Series: Microsoft .NET Development
Author: Anders Hejlsberg, Mads Torgersen, Scott Wiltamuth, and Peter Golde
Publisher: Pearson
ISBN: 9780321562999
Type: Book
Format: Hardcover
Price: US $40
On sale @ Amazon.
Shop @ Pearson.