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Fragment cache is to store user controls individually within a web form in cache instead of the whole webform as such. The idea is to simply have different cache parameters for different user controls. control1:<%@ OutputCache Duration="40" VaryByParam="none"%> control2:<%@ OutputCache Duration="60" VaryByParam="none"%> If control1 and control2 exist on a single webform together, the values of control1 and control2 would be cached for different durations based on @OutputCache directive.