Another technique that can sometimes be used to find otherwise hidden lapsed listeners is preventing a given listener object from being registered twice with a given event source.
另外一项可以用来找到隐藏失效侦听器的技术是：防止指定侦听器对象在指定事件源上登记两次。
The GridView also exposes a RowUpdating event that allows you to modify the values being passed to the data source object.
GridView 也公开一个 RowUpdating 事件，允许您修改正在传递到数据源对象的值。
The source object does not expose '0' event interface.
源对象不公开“0”事件接口。
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