You develop a Web application that contains two master ……

单项选择题You develop a Web application that contains two master pages. You need to dynamically set the master page when a user views pages in the application. What should you do?（）

A.SetPage.MasterPageFile in the Page’sPage_Initevent.
B.SetPage.MasterPageFile in the Page’sOnInit event.
C.SetPage.MasterPageFile in the Page’sPage_Loadevent.
D.SetPage.MasterPageFile in the Page’sPage_PreInitevent.

单项选择题You create a master page named PageBase.master. The master page contains a Label control named lblTitle. You create a content page that references the master page. You need to change the Text property of the master pages lblTitle control from the content page. Which code segment should you use?（）

A.
B.
C.
D.

单项选择题You have an SQL query that takes one minute to execute. You use the following code segment to execute the SQL query asynchronously. Dim ar As IAsyncResult = cmd.BeginExecuteReader() You need to execute a method named DoWork() that takes one second to run while the SQL query is executing. DoWork() must run as many times as possible while the SQL query is executing. Which code segment should you use?（）

A.
B.
C.
D.

单项选择题You have an SQL query that takes one minute to execute. You use the following code segment to execute the SQL query asynchronously. IAsyncResult ar = cmd.BeginExecuteReader(); You need to execute a method named DoWork() that takes one second to run while the SQL query is executing.DoWork() must run as many times as possible while the SQL query is executing. Which code segment should you use?（）

A.
B.
C.
D.

单项选择题You create a Web Form. The Web Form uses the FormView control to enable a user to edit a record in the database. When the user clicks the Update button on the FormView control, the application must validate that the user has entered data in all of the fields.You need to ensure that the Web Form does not update if the user has not entered data in all of the fields. Which code segment should you use?（）

A.
B.
C.
D.