I built a usercontrol that I place on an aspx page and allow a user to click a button and accumulate a listbox of files.
After accumulating the files I want the control to perform a lengthy operation on all the accumulated files.
I added a spinner ani gif to an image tag on the control and "thought" I could set the img tag property visible to show or hide the spinner.
It almost works (I can show the spinner). But I cannot bracket the long operation with a visible=true and end it with a visible=false for the img tag to achieve the desired result.
Any advice on this would be greatly appreciated.