Explain how to implement Fragment Cache - ASP.NET

Explain how to implement Fragment Cache

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:

control2:

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.