Web Transaction Processing
So far, our application enables the user to view information about films and show times. Now, we are ready to take the next step: adding transaction processing capabilities, so that user can purchase tickets.
Specifically, in this part of the tutorial we're going to:
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Create a server-side method and call it from a Web page; 
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Define a page programmatically, using server-side code, rather than a CSP file; 
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Learn about session management and how to detect and clean up when the user abandons a transaction; and 
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Modify the contents of a Web page, in response to a browser event, without retransmitting the entire page.