I'm creating an ASP.NET application that needs to get data from database (time consuming) and show some indication (e.g. gif animation) that the application is doing something. After that the data should be send to user that the user can save or open the CSV file.
The problem is that I need to do this with one button click. If I combine the code to one button click handler the data is sent correctly but the gif animation is not hidden because the page is not updated. How to do this correctly with one button click?
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