One of the most sure-fire ways to improve a web application's performance is to employ caching. Caching takes some expensive operation and stores its results in a quickly accessible location. Since it's inception, ASP.NET has offered two flavors of caching:<ul><li><b>Output Caching</b> - caches the entire rendered markup of an ASP.NET page or <a href="http://www.asp101.com/lessons/usercontrols.asp">User Control</a> for a specified duration.</li><li><b>Data Caching</b> - a API for caching objects. Using the data cache you can write code to add, remove, and retrieve items from the cache.</li></ul>Until recently, the underlying functionality of these two caching mechanisms was fixed - both cached data
