A step by step guide to the Reactive Extensions to .NET. This free book guides the user through all facets of the Reactive Extensions to .NET (Rx), progressively digging deeper in to its features and concepts. Readers will learn about the Rx types, operators and concepts. The book leads the user down a path to mastering Rx using examples and in depth analysis of the core concepts to effectively using Rx. The book is based on a popular blog series by the author, but is vastly improved extending breadth and depth of content. Most users will find it a concise and informative read, which is best read in order and in full. The book will then server as an excellent reference guide, to check back on during day-to-day development.