I was recently having problems getting the loading GIF to show up when I was updating my UpdatePanel. This is the solution I came up with to get it working.













                    

                       

                    
                

                




                         

                          

                               
    

                            

                            

                                
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The javascript at the bottom determines when the updatepanel is being refreshed, and uses two handlers to change the css of the page to show my loading gif.