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How can you cache Multiple Versions of a Page?

Posted By :shah268     Posted Date :November 26, 2009    Points :10   Category :C# 
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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