Partial (Fragment) Output Caching with a User Control
MyDropDownList:

This control contains: 

<%@OutputCache Duration="10" VaryByControl="MyDropDownList" %>
Control was executed at 19/11/2008 14:49:00

Page contains: 

<%@OutputCache Duration="5" VaryByParam="*" %>
Page was executed at 19/11/2008 14:49:00

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