No book is the product of just the author—he just happens to be the one with his name on the cover.

A number of people contributed to this book, and it would take more space than I have to thank each one individually.

I must thank my colleague Steven Cheng and Packt acquisition editor Rashmi Phadnis—without you, I wouldn't have a chance to write this book. Thanks to Packt Development Editor Dhwani and Project coordinator Leena. You two stayed with me throughout the writing process. I cannot imagine what could come out without your help. Also thanks to Technical Editor, cool Gaurav and Rukhsana Khambatta. My thanks also go to the Copy Editor of this title Sanchari Mukherjee.

I want to thank the reviewers of the book: Ryan Vice, Dave Newton, Geert van Horrik, and Ryan Andrus. Thanks for your patience and comments. Without your effort, the book would have been full of mistakes and incomplete.

I also want to thank my colleagues from Microsoft: XianFeng Zhang, Guang Yang, SGuy Ge, Steve Danielson, Nate Talbert, and Dan Glick. Thanks for your help in the WF and WCF 4.0 discussion list.

Finally, I want to thank my Mom and Dad, thanks for your love and understanding.