The Sys.Application object (Figure A-17) object represents the central point for handling client components registered in the application and it is also the one that exposes the main page life cycle events. It works with the Sys.ScriptLoader object to load the scripts in the page.

Figure A-17 Sys.Application

Sys.ApplicationLoadEventArgs (Figure A-18) extends Sys.EventArgs and stores the information passed by the load event of Sys.Application.

Figure A-18 Sys.ApplicationLoadEventArgs

Sys.Browser (Figure A-19) contains contains information based on browser detection and is used throughout the library to solve compatibility issues.

Figure A-19 Sys.Browser

Sys.CancelEventArgs (Figure A-20) extends the Sys.EventArgs class and offers a base class for all the canceled event arguments.

Figure A-20 Sys.CancelEventArgs

Sys.Component (Figure A-21) is the base class for all the components, controls, and behaviors. It is used so that the objects’ lifetime is managed by Microsoft AJAX Library.

Figure A-21 Sys.Component

Sys.CultureInfo (Figure A-22) represents the base class for objects storing culture-related information.

Figure A-22 Sys.CultureInfo

Based on this class we also have two additional objects:

Sys.Debug (Figure A-23) provides methods that can be used for debugging and tracing functionality.

Figure A-23 Sys.Debug

Sys.EventArgs (Figure A-24) represents the base class for all the event arguments objects passed by event sources. Sys.EventArgs.Empty represents such an object and is defined in Microsoft AJAX Library.

Figure A-24 Sys.EventArgs

Sys.EventHandlerList class (Figure A-25) is used for storing event handlers for different events. The events’ names represent the keys and a list of event handlers the values in an internal dictionary.

Figure A-25 Sys.EventHandlerList

The Sys.IContainer interface (Figure A-26) defines methods for all components that contain other components. It is implemented by Sys.Application.

Figure A-26 Sys.IContainer

The Sys.INotifyDisposing interface (Figure A-27) represents a common interface for closing and releasing resources held by objects registered using Microsoft AJAX Library.

Figure A-27 Sys.IDisposable

The Sys.INotifyPropertyChange interface (Figure A-28) defines the disposing event. When implemented, it notifies other objects when it is about to release resources. It is implemented by Sys.Component and thus by all components, behaviors, and controls.

Figure A-28 Sys.INotifyDisposing

The Sys.INotifyPropertyChange interface (Figure A-29) defines the propertyChanged event. It is implemented by Sys.Component and thus by all components, behaviors, and controls.

Figure A-29 Sys.INotifyPropertyChange

Sys.PropertyChangedEventArgs (Figure A-30) extends Sys.EventArgs class and is used as an event argument by the propertyChanged event.

Figure A-30 Sys.PropertyChangedEventArgs

Sys.ScriptLoader (Figure A-31) offers a centralized mechanism for loading script files.

Figure A-31 Sys.ScriptLoader

Sys.ScriptLoaderTask (Figure A-32) is used by Sys.ScripLoader to load a particular script file.

Figure A-32 Sys.ScriptLoaderTask

Sys.StringBuilder class (Figure A-33) offers a mechanism for concatenating strings.

Figure A-33 Sys.StringBuilder