Sometimes you need to store control-state data in order for a control to work properly.
For example, if you have written a custom control that has different tabs that show different information, in order for that control to work as expected, the control needs to know which tab is selected between round trips. The ViewState property can be used for this purpose, but view state can be turned off at a page level by developers, effectively breaking your control. To solve this, the ASP.NET page framework exposes a feature in ASP.NET called control state.
The ControlState property allows you to persist property information that is specific to a control and cannot be turned off like the ViewState property.
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