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System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index at System.ThrowHelper ...

(1)按“学号”分组显示每个学生所学的课程数;(2)显示学生表中所有男生的信息。 24.简述bindingSource控件的AddNew、Find、RemoveAt和CancelEdit这四个方法各自的功能。 程序运行后，单击窗口中的button1按钮，在文本框textBox1中显示的内容是_____。 32.有程序段如下: 程序 ...