dropdownlist控件的值改变时，SelectUndexChanged事件似乎没发生？AutoPostBack属性已设置为true,该怎么解决

dropdownlist控件的值改变时，SelectUndexChanged事件似乎没发生？AutoPostBack属性已设置为true
SelectUndexChanged事件中在表签上显示所选的值.

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SelectUndexChanged??
因该是SelectIndexChanged
labe1.Text=ddl.SelectedItem.Text;