i am using .ashx to retrive image and i place the the image inside the ajax update panel it retrive the image when a new image is added to the form but when we change the image it is not updating the image it dont even call the .ashx file but when i refresh the browser it works properly
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Sounds like a caching issue. Try adding some of the lines found here to your ashx file and it should hopefully force the browser to rerequest the image. (I know that the link is for ASP rather than ASP.NET, but things like Response.Expires = -1 should work)
Alternatively, can you change the path to the image in the updatepanel? If you just add a random parameter on to the end of it the browser will treat it as a fresh request (we use the current date/time as a parameter when we’re doing this. The parameter is ignored by ASP.NET unless you explicitly reference it)