The control's SelectedIndex event is called automatically (the AutoPostBack property of control is set to True) when a user selects a value from the list.
用户从列表中选择一个值时，自动调用控件的SelectedIndex事件(控件的AutoPostBack属性设置为True)。
The control's SelectedIndex event is called automatically (the AutoPostBack property of control is set to True) when a user selects a value from the list.
用户从列表中选择一个值时，自动调用控件的SelectedIndex事件(控件的AutoPostBack属性设置为True)。
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