These controls compare the current value of the control with its previous value, which is stored implicitly in view state if any process has subscribed to the change event.
这些控件比较其当前值与以前值，如果有任何过程预订更改事件，以前值隐式存储在ViewState中。
These controls compare the current value of the control with its previous value, which is stored implicitly in view state if any process has subscribed to the change event.
这些控件比较其当前值与以前值，如果有任何过程预订更改事件，以前值隐式存储在ViewState中。
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