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Server-side Programming Overview
For a detailed list with the server-side properties and methods of the control, see the Server-Side API of the RadDropDownList class.
RadDropDownList supports a number of server-side events that let you respond to events with complex actions that can't be performed in client-side code.
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SelectedIndexChanged occurs when the SelectedIndex has just changed.
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ItemSelected occurs when an item from the dropdownlist is selected.
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ItemDataBound occurs for each item when it is being bound to a data value.
The SelectedIndexChanged and ItemSelected events do not fire unless you set the AutoPostBack property to True .