ASP.net - Caching by Query-String (VaryByParam) -

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In which situation should we use Question-String (VaryByParam) to get caching in ASP.NET?

In the case of a web-application can give an example of the real-life situation? 

  product.aspx? ProductID = 12345

Obviously you do not want to get the data for the product. Output cache of SPX, which was requested.

In detail

If I hit Products.aspx? ProductID = 12345 will be processed on the page, see the information for product 12345 and cache the result then you Products.aspx? ProductID = 54321 , the page will not be processed for you, but products.aspx will be taken from the output cache and you will see the information for 12345. Not good, VaryByParam solves it.


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