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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.
You have the following requirements:
- Run client-side validation tests on a large result set from a Microsoft SQL Server 2008 database. - Validate each row of data without storing the entire result set in memory.
You need to recommend a data access technology.
What should you recommend?

A) LINQ to SQL using the ElementAt() method
B) ADO.NET using SqIDataReader objects
C) ADO.NET using SqIDataAdapter objects and DataSet objects
D) LINQ to Entities using the ElementAt() method

2. You are designing an application by using Windows Presentation Foundation (WPF), Microsoft .NET Framework 4, and Microsoft SQL Server 2008.
The application will contain several forms that include custom data validators.
You need to ensure that data is validated before the database updates occur. You also need to ensure that the validation logic can be reused.
How should you design the validation?

A) Subscribe to the MouseLeave event for all user interface (UI) components of the application.
Perform data validation in the event handler and alert users when a data entry error occurs.
B) Subscribe to the TextChanged event for all user interface (UI) components of the application.
Perform data validation in the event handler and alert users when a data entry error occurs.
C) Implement the INotifyPropertyChanged interface in the data class of the application.
D) Implement the IDataErrorlnfo interface in the data class of the application.

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

4. You are analyzing an application that uses Microsoft .NET Framework 4 and Microsoft SQL Server 2008.
The application is used to maintain an inventory database and is accessed from several remote Windows client applications. The application frequently updates multiple rows in a database table by using a DbDataAdapter object.
Users report that the application runs slowly during peak business hours.
When large number of records are changed by multiple users, you discover the following:
The CPU utilization of the client applications is normal.
The network utilization increases slightly.
The CPU utilization of the database server remains close to the normal average
for a day.
You need to resolve the performance issue.
What should you do?

A) Remove any limit on batch update sizes. Modify the client application to perform a single update.
B) Insert a random time interval between updates.
C) Move the update method calls to a separate BackgroundWorker thread.
D) Disable batch updates. Modify the client application to perform a single update.

5. 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) 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) Store the results of the query in a local XML file. Bind all forms to an XMLDataAdapter object that references the local XML file.
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.

Solutions: