what is the use of Response.Cache.SetCacheability?

NoCache: Sets the Cache-Control: no-cache header. Without a field name, the directive applies to the entire request and a shared (proxy server) cache must force a successful revalidation with the origin Web server before satisfying the request. With a field name, the directive applies only to the named field; the rest of the response may be supplied from a shared cache.

When HttpCacheability is set to NoCache or ServerAndNoCache the Expires HTTP header is by default set to -1; this tells the client not to cache responses in the History folder, so that when you use the back/forward buttons the client requests a new version of the response each time.

once go through this link
http://stackoverflow.com/questions/3854955/what-it-means-response-cache-setcacheabilityhttpcacheability-nocache-respons

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V.SaratChand
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The

Response.Cache.SetCacheability(HttpCacheability.NoCache)

refers to let the browser knows to not to cache this page. So the browser does not cache any page specific resources.
The

Response.Cache.SetAllowResponseInBrowserHistory(false)

refers to let the browser knows to not to allow this page in the browse history. So you cannot see the page in the browser history.

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