MCPDMCPD(70-511)多項(xiàng)選擇題每日一練(2019.05.12)

You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.  
The application contains a composite user control that includes a TextBox control named txtInput.  
The user control will be hosted in a window and will have handlers for the text-changed event of txtInput. 
You need to ensure that the application meets the following requirements: 
AddHandler(TextBox.TextChangedEvent, new RoutedEventHandler(Audit_TextChanged), true);
Which of the following statments are TRUE ?（）

You use Microsoft .NET Framework 4 to create a Windows Forms application. 
You add a new class named Customer to the application.  
You select the Customer class to create a new object data source. 
You add the following components to a Windows Form: 
A BindingSource component named customerBindingSource that is data-bound to the Customer object data source.
A set of TextBox controls to display and edit the Customer object properties.
Each TextBox control is data-bound to a property of the customerBindingSource component. 
An ErrorProvider component named errorProvider that validates the input values for each TextBox control. 
You need to ensure that the input data for each TextBox control is automatically validated by using the ErrorProvider component. 
Which two actions should you perform?（）

You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.  
The application uses the background worker process (BWP).  
When the user clicks a button,
the background worker executes a method named DoCalculations asynchronously. 
You need to implement a progress bar on the user interface (UI) that informs the user of the progress of DoCalculations. 
Which two actions should you perform?（）

You use Microsoft .NET Framework 4 to create a custom Windows Presentation Foundation (WPF) application. 
Your environment includes several WPF applications. The applications use the same logo and style configuration as part of a corporate standard.  
You need to ensure that the existing applications can be updated to use the same logo and style settings without recompiling. 
Which two actions should you perform?（）

You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. 
You write the following code segment. (Line numbers are included for reference only.) 

the TextBox control is data-bound to an instance of the Contact class.  
You need to ensure that the Contact class contains a business rule to ensure that the ContactName property is not empty or NULL.
You also need to ensure that the TextBox control validates the input data. 
Which two actions should you perform?（）