Online Access Free 70-518 Exam Questions

You are developing a Windows application by using Microsoft .NET Framework 4 and Microsoft Visual Studio 2010.
The application will consume a Windows Communication Foundation (WCF) service. The WCF service will provide data to the application. You plan to use the ADO.NET Entity Framework to create a data model that will be used by the application.
Another development team makes changes to the WCF service data contract.
You need to ensure that changes made to the WCF service data contract do not require the application to be recompiled.
What should you do?

• A.Create a storage model based on the schema of the existing WCF service. Update the mapping file when the new version of the WCF service is available.
• B.Create a conceptual model based on the business model. Use a class generated from the conceptual model for programming. Update the mapping file when the new version of the WCF service is available.
• C.Create a storage model based on the business model. Use a class generated from the storage model for programming,
• D.Create a conceptual model and a storage model based on the existing version of the WCF service.

You are designing a Windows application by using Microsoft .NET Framework 4 and Microsoft Visual Studio 2010.
The business logic layer of the application is implemented by using Windows Communication Foundation (WCF).
You create a duplex bidirectional WCF service that contains a single operation. The service operation sends the result back to the client application by using a two-way callback operation.
You plan to design a service interaction strategy.
You need to ensure that deadlocks are prevented.
What should you do?

• A.Configure the ServiceBehaviorAttribute attribute to use the Synchronization context in the service class.
• B.Configure the ServiceBehaviorAttribute attribute to use the Reentrant or Multiple concurrency mode in the service class.
• C.Configure the CallbackBehaviorAttribute attribute to use the Synchronization context in the callback class.
• D.Configure the CallbackBehaviorAttribute attribute to use the Reentrant or Multiple
  concurrency mode in the callback class.

You are designing an n-tier solution that includes a Windows Presentation Foundation (WPF) client application. The WPF application connects to a middle-tier server that runs the data access layer.
The data access layer connects to a Microsoft SQL Server 2008 database and to a mainframe-based database.
The mainframe-based database will be replaced in one year.
You have the following requirements:
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Centrally manage all database connections.
Minimize changes to the code base when the database is replaced.
Ensure that the WPF application will not need to be redeployed when the database
is replaced.
You need to recommend an approach for designing the data access layer.
What should you recommend?

• A.Create a data access layer class that uses a database factory class to access all databases. Add the connection string information for the databases to the configuration file for the WPF application.
• B.Add the connection string information for the databases to the configuration file for the WPF application. Implement a database factory class from within the WPF application.
• C.Add the connection string information for the databases to the configuration file for the WPF application. Implement one class in the WPF application for each data source.
• D.Create a data access layer class that uses a database factory class to access all databases. Add the connection string information for the databases to the configuration file for the data access layer class.

You are designing a Windows Presentation Foundation (WPF) application that accesses a business tier. The business tier is implemented as a Windows Communication Foundation (WCF) service and stores data in a Microsoft SQL Server 2008 database.
The WCF service will be accessed by external applications that do not use the .NET Framework.
You need to recommend an approach for passing data between layers.
What should you recommend?

• A.Use the DiffGram XML format.
• B.Use a DataSet object.
• C.Use custom .NET classes with binary serialization.
• D.Use custom .NET classes with XML serialization.

You are designing a Windows Presentation Foundation (WPF) application that uses .NET Framework 4. The application uses a subset of the functionality provided by a third-party COM component that will be replaced later.
The application developers must have access to only the required subset of functionality.
You need to recommend a solution that meets the requirements.
Which two actions should you recommend? (Each correct answer presents part of the solution. Choose two.)

• A.In the adapter assembly, use a standard interop reference.
• B.Create an adapter assembly that exposes the required subset of the COM component functionality.
• C.Create an adapter assembly that exposes the entire functionality of the COM component.
• D.In the adapter assembly, use an embedded interop reference.