Why do we need to save&load contol's state?
Viewstate is not enough?

Please explain, thanks.

User control state used to be stored in ViewState in ASP.NET 1.1. In version 2.0, control state was created as a separate state mechanism, so that viewstate could be turned off if desired, without messing up user control state.

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So if I won't disable viewstate I can remove the control state functionality, right?

And also, where do we set the properties like enableHighlighter and _showCategoryPicker of this class?

No. As I said, since the release of 2.0, user controls use Control state, not Viewstate. If you need to preserve state in a user control, you need to use Control state. Viewstate being enabled or disabled has no effect on Control state.

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