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i host my web site into a shared hosting and i need to set expiration header using iis but i didn't find my hosting allow this feature so , is there any way to set it into my web configuration or into my code ??

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Google is your friend :)

MSDN Article: HttpResponse.AddHeader Method

You can also use HttpResponse.AppendHeader, which is semantically the same as HttpResponse.AddHeader.

Good Luck.

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You can use this code in Page_Load

Response.Headers.Add("Expires", "ddd, dd m YYYY hh:mm:ss GMT");

You have to change the date for yours

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is this will work with the page all for all the items related to my pages like images .
No this will only set the cache header for the HTML page.

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