UpdatePanel Server-Side Page Execution Life Cycle
You need to understand that a server-side page goes through its normal page execution life cycle when you perform an asynchronous postback. The Page
PreRender events are raised for an asynchronous postback in just the same way as these events are raised for a normal postback.
Figure 38.8. Viewing an asynchronous postback’s server lifecycle.
When you first open the page in Listing 38.10, each page event is listed in the ...