The book makes references several times to the beta version of the .net sdk (just to give you an idea of how old it is).

It's really no more than a standard article you would see on a site like codeproject.com and doesn't really go into enough detail to make it worthwhile.

It leaves much of the practical details and implementation up to the reader (in particular nothing about html apps althought it lightly refers to them).

If you know enough to put this book to use, you already know enough to build your own system without reading this book.

If the author were to update it, provide the source code and expand it out to the level of making it workable in a real world application it would be worth the money.