###BeginCaseStudy###
Case Study: 2
Web Application
Background
You are developing an online shopping web application.
Business Requirements
 A user is not required to provide an email address. If a user enters an email address,
it must be verified to be a valid email address.
 Information about the first product on the product page must fade out over time to
encourage the user to continue browsing the catalog.
 Administrators must be able to edit information about existing customers.
 Administrators also must be able to specify a default product on the product page.
Technical Requirements
General:
 The web store application is in a load-balanced web farm. The load balancer is not
configured to use server affinity.
 The web store application is an ASP.NET MVC application written in Visual Studio
2012.
Products:
 The value of the productId property must always be greater than 0.
 The Products page for mobile devices must display to mobile users. The Products
page for desktop devices must display to desktop users.
Storage:
 The data must be stored in a serialized XML data format.
 Serialized objects must be schema-independent.
Exception handling:
 Exceptions originating from IIS must display a page with support contact
information.
 Some page links expire, and users who access these links encounter 404 errors.
 Exceptions must be logged by using the WriteLog method of the Utility class.
Browser and device support:
 The application must support image format conversions from .bmp to .jpeg for
mobile devices.
 The application must support image format conversions from .bmp to .png for
desktop devices.
Application Structure

###EndCaseStudy###

You need to ensure that new customers enter a valid email address.
Which code should you use? (Each correct answer presents part of the solution. Choose all that
apply.)

A.
Option A

B.
Option B

C.
Option C

D.
Option D