You can create any image in GDi and have the page refer to it:
http://blog.3203.com/2007/
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Transparent gif to output stream
How do I write an existing gif image to the outputstream in ASP.NET, so i can use an aspx page as image source - <img src='mypage.aspx'>... The image should be a 1x1 transparent gif...
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by: Justin_WPosted on 2007-08-16 at 12:35:13ID: 19711635
The trick is to send the file back to the client as an attachment. This works for any type of file, but the browser decides how to respond (e.g. display vs. prompt user to save) based upon the type of the file returned. For an image file, it should automatically get displayed.
Here is a tutorial on how to do it:
http://www.aspnetmime.com/