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Well, you can't turn off, or hide, or so ANYTHING from code behind. You click on a button, and the page gets sent to the server. Then code behind runs, and then the page is sent back down.

code behind NEVER interacts directly with the user. The page post back sends teh WHOLE page to the server. When code beind runs, it can modify controls, text box etc. However, the user sees zero of that until ALL CODE behind is done, and then the WHOLE page makes it trip back down to the client side, is re-loaded, JavaScrip re-runs, and then the page is displayed. So, mucking around with all kinds of server side code is a 100% waste of time and is a wild goose chase.

However, with a simple grasp of the page life-cycle, and post backs (the so called round trip), then some solutions become easy - in fact VERY easy here.

So, for whatever you want to do? Say click on on a button? Then add both a client side event, and a server side event.

The client side can now display the spinner (animated gif) or whatever. And in fact in 99% of cases, you don't need ANY code to hide that spinner or whatever, since when all that server side code behind is done? Well, a whole new copy of the web page comes racing down from the server, and thus you get a re-plot and re-load of the WHOLE page for free - including that of your hidden spinner/gif now being hidden agian.

So, at the most simple level, try this code on a blank new test page:

You don't need fancy code, you don't need threading, you don't need much of anything. (but you do need a simple grasp of how page post-backs work).

So, we going to drop a button on a web page. We will click on that button, and we have a long running server side button code behind (say 5 seconds). When the code behind is done, the spinner will go away.

So, we have this markup: a button, and then animated "gif" spinner:

You can use an enumerated sequence to get the index and the string for each element.

The algorithm in debugging is to start with something tiny, that works and then to continue.

For a beginning - take this 4 lines only and run them:

Give this a try:

how I could display a composed image with a postfix notation by explaining how to modify my function so that it can consider a maximum of cases?

That's really trivial. Just display it for this cell or display for the childs.

Perhaps it is because the work (run method) for your timer task runs in a separate thread and is not in the Swing event-handling thread?

I suspect you should be calling SwingUtilities.invokeLater in your timer's run method so that the changes to the label are done in the Swing event-handling thread.

The source code is valid:

1. You attach an image to the mail item in Outlook:

If you want to load local images, in Android, Place images in the Resources/drawable directory with Build Action: AndroidResource. In ios, The preferred way to manage and support images since iOS 9 is to use Asset Catalog Image Sets. Then use Asset Catalog Image Sets. The picture name can get the picture.

Your code isn't "async all the way" and the compiler will have given you a warning/error about using await in a method that isn't async.

You need to make MailWithAttachment and MailAttachment async and then use await correctly. For example: