Question

prevent browser from caching image

Asked by: esc7

How do I prevent an image in a web page from being cached by the browser?

I am programatically generating a gif image in my ASP.Net application.  The client types some text and I convert it to an image file.  When the client changes the text and re-submites (replacing the previous image file) the image is not refreshed (only shows old image).  The name of the file on the server does not change because I dont want to save a new file each time the client changes the text (file name is sessionid + extension).

The image is a .net server control.

Any ideas?

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Asked On
2007-06-14 at 20:19:00ID22635556
Tags

prevent

,

caching

,

image

,

browser

,

from

Topics

Web Images

,

Programming for ASP.NET

,

.NET Framework 2.x

Participating Experts
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Answers

 

by: ryancysPosted on 2007-06-14 at 20:30:39ID: 19289006

try add this to clear your page cache:

Response.Cache.SetCacheability(HttpCacheability.NoCache);

 

by: mmarinovPosted on 2007-06-15 at 01:03:33ID: 19289912

Hello esc7,

check this article: http://www.developerfusion.co.uk/show/228/ - there are listed the headers that can stop the caching

Regards,
mmarinov

 

by: vardiumPosted on 2007-06-15 at 02:27:49ID: 19290226

You can add a random number after the image name
like xxxxxx.jpg?rnd=1234567890

 

by: skvikramPosted on 2007-06-15 at 06:43:52ID: 19291753

make image src equal to an .aspx page. in this page bind the image at runtime. so whenever the image is displayed there will be aspx extension instead of image extension itself.

20120131-EE-VQP-002

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