The CreateObject method creates an instance of a server component. If the component has implemented the OnStartPage and OnEndPage methods, the OnStartPage method is called at this time. For more information about server components, see Installable Components for ASP.
Server.CreateObject( progID )
By default, objects created by the Server.CreateObject method have page scope. This means that they are automatically destroyed by the server when it finishes processing the current ASP page.
To create an object with session or application scope, you can either use the <OBJECT> tag in the Global.asa file and set the SCOPE attribute to SESSION or APPLICATION, or store the object in a session or application variable.
For example, an object stored in a session variable, as shown in the following script, is destroyed when the Session object is destroyed. That is, when the session times out, or the Abandon method is called.
<% Set Session("ad") = Server.CreateObject("MSWC.AdRotator")%>
You can also destroy the object by setting the variable to Nothing or setting the variable to a new value, as shown below. The first example releases the object ad. The second replaces ad with a string.
<% Session("ad") = Nothing %>
<% Session("ad") = "some other value" %>
You cannot create an object instance with the same name as a built-in object. For example, the following returns an error.
<% Set Response = Server.CreateObject("Response") %>
<% Set MyAd = Server.CreateObject("MSWC.AdRotator") %>
The preceding example creates a server component, MyAd, as a MSWC.AdRotator component that can be used to automate rotation of advertisements on a Web page.
For more information about server components, see Building Components for ASP.