Re: ASP.NET Image Caching Problem (How to Disable it?)

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From: Lenard Gunda (frenzy_at_fbi.hu)
Date: 08/07/04 

Date: Sat, 7 Aug 2004 20:28:48 +0300

I had a similar problem. But I think it's more a client side issue. Anyway
...

... I solved it with a rather unusual way. Generate a unique ID string from
letters and/or numbers, and append it to the image as a HTTP GET parameter.
Like:

http://hostname/path/image.gif?uid=4235236

Make sure it changes all the time. A bunch of random numbers should do the
trick. And no more caching problems. (actually, I used it with an .aspx
page, that generate it's output everytime, but it doesn't matter). If it
really is a normal image, a parameter like in the example link above will
not disrupt the download.

-Lenard

"Mike Sobeiski" <mickey@nospam.com> wrote in message
news:OYKmf$IfEHA.1692@tk2msftngp13.phx.gbl...
> Hi There!
>
> I'm developing a web project that requires to produce charts off the
> database and output it as image and presented to the user in a HTML
> document. (NOTE: Image is not directly streamed, but just linked in HTML
> output).
>
> The problem is, when user want to see the graph by changing parameters,
they
> always have to click refresh to see the updated graph image. Although this
> problem doesn't occur on the local server.
>
> So I'm just wondering, how to turn off the image caching in my ASP.NET
> project so that users don't need to click Refresh every time they change a
> parameter to see a different chart image?
>
> Many thanks!
>
> Mike
>
>
>

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