How can you cache Multiple Versions of a Page?

 Posted by Bhakti on 11/16/2009 | Category: C# Interview questions | Views: 2567
Answer:

Using output cache you can cache multiple versions of the page.

We can either use,…
- @ OutputCache directive at design time declaratively for Declarative Approach
OR
- Response.Cacheclass at runtime for Programmatic Approach.

With @ OutputCache directive four parameters of VaryByParam , VaryByControl, VaryByHeader, VaryByCustom allows user to cache page depending on query string, control value, request's HTTP header, request's HTTP header respectively.
For an example:

To turn off caching,
Declarative Approach:
<%@ OutputCache Location="None" VaryByParam="None" %>

Programmatic Approach:
Response.Cache.SetCacheability(HttpCacheability.NoCache);


To cache the output for each HTTP request that arrives with a different ID:
Declarative Approach:
<%@ OutputCache duration="60" varybyparam=" ID" %>

Programmatic Approach:
Response.Cache.SetExpires(DateTime.Now.AddSeconds(60));

Response.Cache.SetCacheability(HttpCacheability.Public);
Response.Cache.VaryByParams["ID"] = true;


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