Allen K. Scott Allen 
Programming Windows Workflow Foundation: Practical WF Techniques and Examples using XAML and C# 

Fast-paced and to-the-point, this book takes you through the important topics of Windows WF development with clear explanations and practical example code. The book’s selection of topics is driven by what the working developer needs to know. It is neither a comprehensive reference to the whole WF architecture, nor a strategy guide to the complete application development lifecycle. It’s just what you as a C# developer need to know to use WF in your applications. This book is for .NET developers who want to enhance their applications with flexible workflow capabilities using Microsoft Windows Workflow Foundation. The author assumes that you have read other texts on the overall architecture of WF and on WF application design strategies, and instead focuses on real-work implementation issues for C# developers.