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Microsoft PRO: Design & Develop Wndws Apps Using MS .NET Framework 4 Sample Questions:

1. You are designing a Windows Presentation Foundation (WPF) application by using Microsoft .NET Framework 4, Microsoft Visual Studio 2010, and Microsoft SQL Server 2008.
You have designed the application to use the ADO.NET Entity Framework for the Data Access Layer (DAL).
You have designed the user interface (UI) of the application by using the Model-View-ViewModel (M-V-VM) pattern.
The middle tier of the application is designed by using Windows Communication Foundation (WCF).
The database schema changes often. The DAL entity objects are required to be referenced from the middle tier and the ViewModel layer of the UI.
You need to ensure that the DAL entity objects are updated when the database schema changes.
What should you do?

A) Create persistent-ignorant objects.
B) Create an observable collection of objects.
C) Create typed DataSets.
D) Create persistent-aware objects.

2. You are designing a Windows Presentation Foundation (WPF) application.
The WPF application contains code that will be executed by both full trust callers and
partial trust callers.
The WPF application code does not have the AllowPartialTrustCallers attribute set.
You have the following requirements:
- The application security settings must allow partial trust callers to create and write to a file. - Users must have access only to files that they create and not to files created by other users.
You need to recommend a location for storing each user's files.
Which location should you recommend?

A) The user's LocalSettings folder
B) The user's Roaming folder
C) The user's IsolatedStorage folder
D) The user's My Documents folder

3. You are designing an application by using Windows Presentation Foundation (WPF) and Microsoft .NET Framework 4.
The application retrieves customer data from an enterprise resource planning (ERP) system.
You need to ensure that the following requirements are met:
---
Customer data is retrieved only once.
Customer data is available on multiple forms within the application.
Forms can implement Two-Way binding to the customer datA.
What should you do?

A) Store the results of the query in a local XML file. Bind all forms to an XMLDataAdapter object that references the local XML file.
B) Design a static class for the data that implements the IObservable interface. Subscribe to the static class from each of the forms that use the datA.
C) Design a static class for the data that implements the INotifyPropertyChanged interface. Raise the PropertyChanged event to notify the forms when data is changed.
D) Store the results of the query in a static Data Table object that is used by all the forms.

4. You are designing a Windows Presentation Foundation (WPF) application for your company by using Microsoft .NET Framework 4 and Microsoft Visual Studio 2010.
The business layer of the application is implemented by using Windows Communication Foundation (WCF).
You plan to support non-repudiation and data integrity for WCF messages.
You need to design the security strategy for the application.
What should you do?

A) Attach a digital signature to the WCF messages.
B) Encrypt the WCF messages by using the Internet Protocol Security (IPSec) protocol.
C) Encrypt the WCF messages by using the Secure Sockets Layer (SSL) protocol.
D) Implement message-level security by using digital certificates as client computer credentials.

5. You are designing a .NET Framework 4 solution that includes a Windows Presentation Foundation (WPF) application. The WPF application connects to a Microsoft SQL Server 2008 database. You plan to deploy the WPF application to millions of client computers. The SQL Server database will be hosted in a data center.
The WPF application will query the database to provide type-ahead assistance as users enterdata.
The WPF application will send a query after each character is entered. Each query will access multiple joined tables.
You need to recommend an approach for maximizing scalability of the solution.
What should you recommend?

A) Use System.Runtime.Caching to cache query results on the client.
B) Create stored procedures to abstract the tables.
C) Create a separate data layer with caching.
D) Denormalize the data to fewer tables.

Solutions:

Question # 1 Answer: A

Question # 2 Answer: C

Question # 3 Answer: D

Question # 4 Answer: A

Question # 5 Answer: C