Caching in ASP.NET

Hi Nayak Ji...



I asked only difference among the

                VaryByParam="Parameter"
                VaryByParam=" * "
                VaryByParam="None"

What is the meaning of parameter, * and none ? Please give sort and suitable answer .......

Hi Vineet,


none    One version of page cached (only raw GET)
*        N versions of page cached based on query string GET/ POST body


The VaryByParam is a useful setting that can be used to cache different "views" of a dynamic page whose content is generated by GET or POST values. For example, you may have an ASP.NET Web page that reads in a Part number from the QueryString and displays information about a particular widget whose part number matches the QueryString Part number. Imagine for a moment that Output Caching ignored the QueryString parameters altogether (which you can do by setting VaryByParam="none"). If the first user visited the page with QueryString /ProductInfo.aspx?PartNo=4, she would see information out widget #4. The HTML for this page would be cached. The next user now visits and wished to see information on widget #8, a la /ProductInfo.aspx?PartNo=8. If VaryByParam is set to VaryByParam="none", the Output Caching engine will assume that the requests to the two pages are synonymous, and return the cached HTML for widget #4 to the person wishing to see widget #8! To solve for this problem, you can specify that the Output Caching engine should vary its caches based on the PartNo parameter by either specifying it explicitly, like VaryByParam="PartNo", or by saying to vary on all GET/POST parameters, like: VaryByParam="*".


Refer

http://www.4guysfromrolla.com/articles/022802-1.aspx


Thanks