Rating:  - Great Tutorial on LINQ
The book covers a lot of topics that emcompass LINQ including LINQ basics, but also LINQ to SQL, LINQ to XML. I like that it starts out with a discussion of the problem and doesn't dive directly into the solution. In addition, I think it teaches the technology without resorting to starting with database applications as the example. Anyone who has heard me talk about LINQ knows that I can't stand that LINQ to SQL is the wrong way to teach it to new people...they didn't fall into that trap.
In addition, I really like that there are lots of good examples and a great index. There was never an example I was looking for that the index didn't help me find. That's becoming rarer in books. I really liked their coverage of LINQ from both the consumer of LINQ and the provider of LINQ. Their discussion of the LINQ to Amazon provider provided quite a lot of good insight into how the inner workings of LINQ are put together.
My only hesitation at completely loving this book is that all the examples are either in C# or VB. This lends the book to feel a bit schizophrenic. I would have preferred a more bloated book where all the example in print were in both languages. This is especially true of LINQ because the language integration of LINQ is very dissimilar between the languages.
Overall, I would recommend the book to anyone trying to learn LINQ as a technology.
Rating: - An important book, on an important topic
LINQ in Action, at 600 pages provides a substantial introduction and in-depth discussion of LINQ, its history, its impact, and most important - its syntax and features. I found this book easy to navigate, given that many developers (I know I do) moved between LINQ to Objects, LINQ to XML and LINQ to SQL througout the working day. When you stumble over a particular query, I found it easy to find a relavent sample in the index.
If you haven't had an opportunity to move into the .NET 3.5 Framework world and use C# .0 or VB 0 syntax yet, then this book will arm you with the background necessary to move productively into the new 'Query Centric' programming paradigm - one free of complex 'for' loops and deeply nested 'if' statements (and free of embedded SQL string statements).
Although hefty in size, I recommend this book if you seriously want to move beyond the basics and really understand how to use LINQ.
Rating:  - Linq in Action
This book is best used with a companion book covering basic C# terms. I found that I had to refer to the internet for explanations of terms.
Explanations, not just definitions. That need slowed my reading to a crawl. though I have been using C# for the past year.
Rating: - Very, very nice and good book
This is a very nicely written book.
Clear explanations, concepts are introduced gradually and build on each other with no forward references, simple and to the point code samples, good and appropriate pace, and very easy to read and understand.
I was actually amazed by this book. I read a couple of books/month, and this book reminded me a lot of the quality of classic CS books, which is so hard to come by nowadays -- think "The unix programming environment", but more accessible.
This is in sharp contrast with most of the today books in the (programming/CS) field which tend to have a big ratio of page-count to information (lots of screenshots, or 101/intro-level intermixed content, lots of fluff). This is not a book that you can shrink without loosing quality.
Rating:  - LINQ with no action
I am disappointed with this book - it did not meet my expectations. I found many examples and it is really hard to use them because the author hardly explains where all comes from and why I should go this way and not another one. It sometimes confuses why, where and for what purpose the author shows an example and whether it suits my case. It is hard to decide because there are almost no explanations about roots of examples and basic theory.
However, I am happy with the fact that more and more books about LINQ come up and I do hope to find a proper one for me. Unfortunately, for now, I have to move from one book to another one for finding a solution.
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