How to create page overlay while data is loading - asp.net/jquery/blockui
I'm trying to display an overlay that says "page loading...please wait" while data is being retrived from a sql server. I'm hoping to use the BlockUI plugin for this but anything will do. I have an ASP.NET page using a site.master. The plugin works but no matter what I tried, it only appears AFTER the page was fully loaded. The bulk of the waiting is down to work done in the Global.asax file. In the Session_Start section, I have a function that returns data to populate dropdown menus on my page. This takes about 20 seconds to complete. So, what do I need to do in order to view the overlay