how to remove flickering when the data is being postback
I am using an update panel in my application which has two dropdownlist boxes in it. The items list for each dropdownlist box is dependent on one another. When I select the item of one dropdrownlist box, the contents of other dropdownlist box is also getting changed. But the page becomes blank for some time and after sometime the contents appear in correct stage. The problem for me is that even though I am using ajax update panel the time taken to refresh is more and flickering occurs. How to remove this flickering from the page? Please provide me help ASAP.