while registering into any application ?

See more:

.NET

while registering into any application suppose name, confirm password like this and clicks submit button ?

my requirement is some extra characters need to added to the serial number
and to be saved in database,what would be the code for that?

example:: sno:-2010a01----like this next time 2010a02
name:-ravi
confirm password::-xxxxx


automatically sno need to be added every time when new user is registered.