How to change the visibility of CascadingDropDown control

StackOverflow https://stackoverflow.com/questions/8957379

문제

What is the preferred method to change the visibility property of a .NET Ajax Control Toolkit CascadingDropDown control? I would like to render the control "invisible" when a null value is returned from a query.

It appears that "OnSelectedIndexChanged" event does not fire from the <asp:DropDownList> when using the toolkit extender.

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