C# 9, or C# version 9.0, was released on November 10, 2020.
@ Microsoft
C# Guide
C# Version History
What’s New In C# 9
Here are select books about C# 9.
2021-01-13
C# 9.0
Edition: 1
Series: Pocket Reference
Authors: Joseph Albahari and Ben Albahari
Publisher: O’Reilly
ISBN: 9781098101138
Type: Book
Format: Paperback
Price: US $25
On sale @ Amazon.
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2021-03-30
C# 9.0
Edition: 1
Series: In A Nutshell
Author: Joseph Albahari
Publisher: O’Reilly
ISBN: 9781098100964
Type: Book
Format: Paperback
Price: US $80
On sale @ Amazon.
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2021-05-11
Pro C# 9 With .NET 5
Edition: 1
Authors: Andrew Troelsen | Philip Japikse
Publisher: Apress
ISBN: 9781484269381
Type: Book
Format: Paperback
Price: US $50
On sale @ Amazon.
Shop @ Apress.
2021-06-22
Code Like A Pro In C#
Edition: 1
Author: Jort Rodenburg
Publisher: Manning
ISBN: 9781617298028
Type: Book
Format: Paperback
Price: US $60
On sale @ Amazon.
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2021-09-00
Functional Programming in C#
Edition: 2
Author: Enrico Buonanno
Publisher: Manning
ISBN: 9781617299827
Type: Book
Format: Paperback
Price: US $50
On sale @ Amazon.
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2021-11-16
C# Cookbook
Edition: 1
Series: Cookbook
Authors: Joe Mayo
Publisher: O’Reilly
ISBN: 9781492093695
Type: Book
Format: Paperback
Price: US $60
On sale @ Amazon.
Shop @ O’Reilly.
Here are select books awaiting updates.
2019-03-23
C#
Edition: 4
Series: In Depth
Author: Jon Skeet
Publisher: Manning
ISBN: 9781617294532
Type: Book
Format: Paperback
Price: US $50
On sale @ Amazon.
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2019-03-30
Visual C#
Edition: 5
Series: Starting Out With
Author: Tony Gaddis
Publisher: Pearson
ISBN: 9780135183519
Type: Book
Format: Paperback
Price: US $154
On sale @ Amazon.
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2019-09-10
Concurrency In C#
Edition: 2
Series: Cookbook
Authors: Stephen Cleary
Publisher: O’Reilly
ISBN: 9781492054504
Type: Book
Format: Paperback
Price: US $50
On sale @ Amazon.
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2019-11-26
Programming C# 8.0
Edition: 1
Series: Programming
Author: Ian Griffiths
Publisher: O’Reilly
ISBN: 9781492056812
Type: Book
Format: Paperback
Price: US $70
On sale @ Amazon.
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2020-09-25
Design Patterns In C#
Edition: 2
Author: Vaskaran Sarcar
Publisher: Apress
ISBN: 9781484260616
Type: Book
Format: Paperback
Price: US $40
On sale @ Amazon.
Shop @ Apress.
2020-10-07
Essential C# 8.0
Edition: 7
Series: Microsoft Technology
Author: Mark Michaelis
Publisher: Pearson
ISBN: 9780135972267
Type: Book
Format: Paperback
Price: US $60
On sale @ Amazon.
Shop @ Pearson.
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