Understanding Control Trees
In the previous section, you learned that an ASP.NET page is actually the source code for a .NET class. Alternatively, you can think of an ASP.NET page as a bag of controls. More accurately, because some controls might contain child controls, you can think of an ASP.NET page as a control tree.
For example, the page in Listing 1.13 contains a DropDownList control and a Button control. Furthermore, because the <%@ Page %> directive has the Trace="true" attribute, tracing is enabled for the page.
Listing 1.13. ShowControlTree.aspx
When you open the page in Listing 1.13 in your browser, you can see the control tree for ...
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