One control we haven't discussed in detail yet is the Page class. As explained in the previous chapter, every web page is a custom class that inherits from System.Web.UI.Page. By inheriting from this class, your web page class acquires a number of properties and methods that your code can use. These include properties for enabling caching, validation, and tracing, which are discussed throughout this book.
Table 5-9 provides an overview of some of the more fundamental properties, which you'll use throughout this book.
|IsPostBack||This Boolean property indicates whether this is the first time the page is being run (false) or whether the page is being resubmitted in response to ...|