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The preferable method for making AJAX calls can differ depending on the application. This page demonstrates two options within asp.net. For the purpose of this test page it doesn't matter when and why each option would be chosen. The examples are overly simple because the point of the page is to test and maintain samples, not to create a complex implementation.

1. A fully asp.net solution uses a ScriptManager, an UpdatePanel and .net controls.

2. This combination solution uses HTML controls and jQuery on the client, and Web Services on the server.

1. ScriptManager

2. jQuery

 
Process Flow

Listener

When the listener detects a change in the selection, it kicks off the...

Process

The process examines the selection and updates the...

HTML