单项选择题
You are creating a Windows Forms application by using the .NET Framework 3.5.You write the following code segment to bind a list of categories to a dropdown list.（Line numbers are included for reference only.）
You need to ensure that the dropdown list meets the following requirements：
（1）Displays all category names
（2）Uses the category ID as the selected item value
Which code segment should you add at line 06？（）
A.A
B.B
C.C
D.D
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You are creating a multiple document interface （ MDI） application by using the .NET Framework 3.5 . You configure the frmParent form to be an MDI parent.You write the following code segment （Line numbers are included for reference only.） You need to associate and display the frmChild form and the frmParent form. Which code segment should you add？（）
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You are creating a Windows Forms application by using the .NET.Framework 3.5. You create a new form in your application.You add a SplitContainer control named spcFrame to the form. The SplitContainer control has two SplitterPanel controls named Panel1 and Panel2. You are configuring the SplitContainer control to define the layout of the form. You need to ensure that the following requirements are met： （1）The initial distance from the left edge of the spcFrame splitter is set to 200 pixels （2）The size of the Panel2 SplitterPanel remains unchanged when the form is resized Which code segment should you use？（）
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