单项选择题
You are creating a Windows Forms application for a book retailer by using .Net Framework 3.5.You are creating a Windows form to allow users to maintain a list of books. You write the following code segment.
The variables strTitle and strISBN are already initialized with the necessary values.
Which code segment should you insert at line 07？（）
A.A
B.B
C.C
D.D
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