Asp.Net Display message instead of loading image for long running process

Hi,

When click on button need to display message instead of loading image for long running process.Need to show what is happening in my code behind.Like below stages
stage1.Collecting information from database..........
stage2.Generating PDF document..............
stage3.Sending e-Mail........
stage4.Done.
Note:No need to set default time for stages it need to take message from code behind and display.
Please send me any related links.

Thanks in advance.