单项选择题

A.AB.BC.CD.DYou are creating a Windows Forms applicatio……

You are creating a Windows Forms application by using the .NET Framework 3.5. You plan to modify a list of orders within a DataGridView control in the application. You need to ensure that a value is required in the first column of the grid control.
Which code segment should you use？（）

A.A
B.B
C.C
D.D

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