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| Section | Objectives |
|---|---|
| Topic 1: Design the Layers of a Solution | - Separation of Concerns - Designing Service-Oriented Architectures |
| Topic 2: Design for Stability and Maintenance | - Testing Strategies - Error Handling and Diagnostics |
| Topic 3: Design the Presentation Layer | - UI Responsiveness and Layout Design - WPF and Windows Forms Integration |
| Topic 4: Design the Data Access Layer | - Data Binding and LINQ - Entity Framework and ADO.NET |
| Topic 5: Plan a Solution Deployment | - Deployment Strategies - ClickOnce and Windows Installer |
1. ---
You are analyzing a Windows client application that uses Microsoft Visual Studio 2010 and Microsoft SQL Server 2008.
The application updates two database tables from the main user interface (UI) thread.
You need to ensure that the following requirements are met:
The database tables are either updated simultaneously or not updated at all.
Users are notified of the success or failure of the updates.
Users are able to perform other tasks during the update process.
What should you do?
A) Use TransactionScope in a Using block on the UI thread.
Create a DependentTransaction object within the block and pass the object to the BackgroundWorkerReportProgress method.
Use the object in the ReportProgress method to create a new TransactionScope block.
B) Use TransactionScope in a Using block on the main thread.
Create a BackgroundWorker thread within the block.
Move the database updates to the BackgroundWorkerDoWork method.
C) Use TransactionScope in a Using block on the UI thread.
Batch the database updates by setting the DbDataAdapter.UpdateBatchSize property to 2.
D) Move the database update logic to a BackgroundWorker thread.
Ensure that the thread is enclosed in a TransactionScope Using block in the BackgroundWorkerDoWork method.
2. You are designing a Windows Presentation Foundation (WPF) application by using
Microsoft .NET Framework 4 and Microsoft Visual Studio 2010.
The application will consist of a user interface (UI) tier and a middle tier. The middle tier will
be implemented by using Windows Communication Foundation (WCF).
You plan to design the exception handling strategy for the application. Each method in the middle tier will contain the following catch block. Catch e AsArgumentNullException.
Throw e
When testing the application, you discover that all ArgumentNullExceptions that occur in
the middle tier do not contain accurate stack trace information.
What should you do?
A) Remove the exception parameter from the ArgumentNullException handler.
B) Use a DispatcherUnhandledExceptionEvent handler in the middle tier.
C) Create an ArgumentNullException handler in the UI tier.
D) Use a DispatcherUnhandledExceptionEvent handler in the UI tier.
3. You are designing a distributed Windows Presentation Foundation (WPF) application.
You have the following requirements: - Ensure that all errors are logged in a central location.
- Ensure that the WPF application logs related errors within a single transaction - Secure error information during transmission.
You need to recommend a strategy for collecting error information.
What should you recommend?
A) Write the information to the Windows Application log on each client system. Use Windows Management Instrumentation (WMI) to collect the results.
B) Create a Windows Communication Foundation (WCF) service. Use the wsHttpBinding protocol to transport the information.
C) Create a Windows Communication Foundation (WCF) service. Use the basicHttpBinding protocol to transport the information.
D) Write the information to the Windows Application log on each client system. Use Windows Error Reporting to collect the results.
4. 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 static Data Table object that is used by all the forms.
B) Store the results of the query in a local XML file. Bind all forms to an XMLDataAdapter object that references the local XML file.
C) 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.
D) Design a static class for the data that implements the INotifyPropertyChanged interface. Raise the PropertyChanged event to notify the forms when data is changed.
5. You are developing a Windows application by using Microsoft .NET Framework 4, Microsoft Visual Studio 2010, and Microsoft SQL Server 2008.
New features that require changes to be made to the database schema are added to the application every week.
You need to ensure that the changes made to the database schema do not require the application to be recompiled.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)
A) Modify the xml mapping file when the schema changes occur.
B) Build a conceptual model and use it to access data from the business entities.
C) Modify the conceptual schema xml file when the schema changes occur.
D) Build a storage model and use it to access data from the business entities.
Solutions:
| Question # 1 Answer: D | Question # 2 Answer: A | Question # 3 Answer: B | Question # 4 Answer: A | Question # 5 Answer: A,C |
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