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
正确答案:D
答案解析:有
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