Silverlight 4 Business Apps: Module 3 - User Registration with Authentication, Validation, Rich Text, Styling, and Commands This is module 3 of the Building Business Applications with Silverlight 4 course. This module covers authentication, using the DataForm, setting up validation for the model, the RichTextBox control, implicit styling, commanding, and the fundamentals of MVVM. Hands-On Labs Silverlight Business Apps: Module 3 - Authentication, Validation, MVVM, Implicit Styles and RichTextBox Lab This lab demonstrates how to build a login screen, integrate ASP.NET authentication, and perform validation on data elements. Model-View-ViewModel (MVVM) is introduced and used in this lab as a pattern to help separate the UI and business logic. You will also learn how to use implicit styling and the new RichTextBox control. Videos Silverlight Business Apps: Module 3.1 - Authentication Ian Griffiths covers how to integrate a login screen and authentication into the sample Event Manager application. Silverlight Business Apps: Module 3.2 - MVVM Ian Griffiths covers how to Model-View-ViewModel (MVVM) patterns into the sample Event Manager application. Silverlight Business Apps: Module 3.3 - Validation Ian Griffiths discusses how validation of user input can be integrated into the sample Event Manager application. Silverlight Business Apps: Module 3.4 - Implicit Styles Ian Griffiths discusses why implicit styles are important and how they can be integrated into the sample Event Manager application. Silverlight Business Apps: Module 3.5 - RichTextBox Ian Griffiths discusses the new RichTextBox control and it can be integrated into the sample Event Manager application.