MCPD单项选择题每日一练(2018.11.13)

单项选择题
You are creating a Windows Forms application by using the .NET Framework 3.5. You use LINQ expressions to read a list of customers from the following XML file.You need to obtain a list of names of customers who are 21 years of age or older. Which code segment should you use？（）
A.A
B.B
C.C
D.D
单项选择题
You work as an application developer at Certkiller .com. You are currently in the process of developing a business logic component that requires long calculations. You have identified numerous tasks within this application that can be done asynchronously. You notice that these tasks are mutually dependent and require complex synchronization techniques so that it can manage efficiently. You decide to use Microsoft .NET 2.0 to take advantage of its new thread management features. You need to create and start the application threads. What should you do？（）
A.A
B.B
C.C
D.D
单项选择题
You are designing a web service that will be hosted in Windows Azure. The web service will accept and store structured and semi-structured data. The web service must meet the following requirements： - Update all data within a single transaction. - Enforce the data structure for structured data within the data store. You need to recommend an approach for storing the data. What should you recommend？（）
A. Use Windows Azure Queues.
B. Use a single SQL Azure database.
C. Use a single Windows Azure Drive.
D. Use Windows Azure Table storage.
单项选择题
You are designing a strategy for synchronizing a SQL Azure database and multiple remote Microsoft SQL Server 2008 databases. The SQL Azure database contains many tables that have circular foreign key relationships. You need to recommend an approach for ensuring that all changes in the remote databases synchronize with the SQL Azure database. What should you recommend？（）
A. Use SQLAzure Data Sync Service.
B. Use SQL Server replication.
C. Use SQL Server backup and restore.
D. Use SQL Server database snapshots.
单项选择题
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. You write the following code segment.The TextBox control is data-bound to an instance of the Contact class. You plan to implement an ErrorTemplate in the TextBox control. You need to ensure that the validation error message is displayed next to the TextBox control. Which code fragment should you use?（）
A.
B.
C.
D.