This method first gets a dictionary object of known category/
value pairs and queries the data document for results. This data document is
nothing more than an XmlDocument object loaded with data from an XML file. In fact, if
you look in the App_Data folder in the solution, you??™ll see an XML file called
CarService.xml, which holds the data for the drop-down controls. Figure 7-13 shows the
contents of CarService.xml.
Figure 7-13. CarService.xml
CHAPTER 7 ?– USING THE ASP.NET AJAX CONTROL TOOLKIT (PART 1) 153
CollapsiblePanelExtender Control
The CollapsiblePanelExtender control allows you to easily make visually appealing collapsing
and expanding effects on panels used in your web page with minimal code. This
extender is quite simple yet very flexible and is particularly useful in scenarios where you
have large amounts of text, some of which does not need to be initially presented to the
users. Also with many useful properties, its collapse/expansion behavior can be well customized.
This includes the ability to have the panel auto expand or auto collapse
depending on the mouse hovering.
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