Book Image

Mastering LOB Development for Silverlight 5: A Case Study in Action

Book Image

Mastering LOB Development for Silverlight 5: A Case Study in Action

Overview of this book

Microsoft Silverlight is fully established as a powerful tool for creating and delivering Rich Internet Applications and media experiences on the Web. This book will help you dive straight into utilizing Silverlight 5, which now more than ever is a top choice in the Enterprise for building Business Applications. "Mastering LOB Development for Silverlight 5: A Case Study in Action" focuses on the development of a complete Silverlight 5 LOB application, helping you to take advantage of the powerful features available along with expert advice. Fully focused on LOB development, this expert guide takes you from the beginning of designing and implementing a Silverlight 5 LOB application, all the way through to completion. Accompanied by a gradually built upon case study, you will learn about data access via RIA and Web services, architecture with MEF and MVVM applied to LOB development, testing and error control, and much more.With "Mastering LOB Development for Silverlight 5: A Case Study in Action" in hand, you will be fully equipped to expertly develop your own Silverlight Line of Business application, without dwelling on the basics of Enterprise Silverlight development.
Table of Contents (19 chapters)
Mastering LOB Development for Silverlight 5: A Case Study in Action
Credits
Foreword
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Adding validations


An important aspect of developing LOB applications is the validation of the data entered by the user. There is no need to say that those validations we are about to see, are client-side. So it will be necessary to validate them again, once the data gets server-side. Remember that, although Silverlight is .NET and a sandbox within our browser, it is exposed to hacking by advanced users. That said, we will see two ways to add validations in Silverlight forms.

Implementing the IDataErrorInfo interface is probably the easiest way to add validation in applications. This interface is not new for Winform developers, as we have had it at our disposal since Framework 1. Nevertheless, from Silverlight 4 onwards, we have been able to make use of it. It is really easy to add validations to our applications thanks to this technique. We will use a new example to see how validations work.

Let us create a new Silverlight application called FormValidation, where we will ask the user for...