單項(xiàng)選擇題

You develop a Web control. The Web control consists of labels and associated text boxes. You need to ensure that the Web control has both toolbox and visual designer support. What should you do?（）

A. Add a Web Control Library project to your solution. Define a class that inherits from CompositeControl.
B. Add a Windows Control Library project to your solution. Define a class that inherits from UserControl.
C. Add a Web User Control to your project. Define a class that inherits from UserControl.
D. Add a Mobile Web User Control to your project. Define a class that inherits from MobileUserControl..

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多項(xiàng)選擇題

You are creating a custom user control. The custom user control will be used on 10 Web Forms for an ASP.NET Web site that allows users to register and log on to a personalized experience. The custom user control uses two TextBox controls and two Button controls. You need to ensure that the controls are visible only when users are not logged on to the Web site. You also need to minimize the amount of effort in development and maintenance for the Web site. Which two actions should you perform?（）

A. Add the OnClick event handler for the Login button to the code used in the custom user control.
B. Add the OnClick event handler for the Login button to the code used in the Web Form where the control is added.
C. In the Page_Load method of the Web Form, add a code segment to set the visibility of the TextBox and Button controls where the control is added.
D. In the Page_Load method of the custom user control, add a code segment to set the visibility of the TextBox and Button controls.

單項(xiàng)選擇題

You are creating a DataTable. You use the following code segment to create the DataTable. (Line numbers are included for reference only.)
01 Dim dt As New DataTable("Products")
02 dt.Columns.Add(New DataColumn("Price", _ GetType(Decimal)))
03 dt.Columns.Add(New DataColumn("Quantity", _ GetType(Int32)))
04 Dim dc As DataColumn = New DataColumn("Total", _ GetType(Decimal))
05 dt.Columns.Add(dc)
You need to ensure that the Total column is set to the value of the Price column multiplied by the Quantity column when new rows are added or changed. What should you do? （）

A. Add the following code segment after line 05. dc.ExtendedProperties("Total") = "Price * Quantity"
B. Add the following code segment after line 05. dc.Expression = "Price * Quantity"
C. Write an event handler for the DataTable's TableNewRow event that updates the row's Total.
D. Write an event handler for the DataTable's ColumnChanged event that updates the row's Total.

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You develop a Web control. The Web control consists of labels and associated text boxes. You need to ensure that the Web control has both toolbox and visual designer support. What should you do?（）

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