System.Web Namespace

Enables sharing of global information across multiple sessions and requests within an ASP.NET application.

An ASP.NET application is the sum of all files, pages, handlers, modules, and code within the scope of a virtual directory and its subdirectories on a single Web server.

A single instance of an HttpApplicationState class is created the first time a client requests any URL resource from within a particular ASP.NET application virtual directory. A separate single instance is created for each ASP.NET application on a Web server. A reference to each instance is then exposed via the intrinsic Application object.

Application state is not shared across either a Web farm ( in which an application is hosted across multiple servers ) or a Web garden ( in which an application is hosted across multiple processes on the same computer ).

Application.propertyName = value;
Application.methodName ( arguments );

Application.propertyName = value
Application.methodName ( arguments )

Type var = Application.propertyName;
Type var = Application  [ key ];
Type var = Application.methodName ( arguments );

Dim var as Type = Application.propertyName
Dim var as Type = Application ( key ) 
Dim var as Type = Application.methodName ( arguments )