i have create a registration form in asp.net & sql server..It's working good..
i generate ID for user when they click "sign Up" button..(the ID will appear in drop down list at form-ID not saved yet into database)..
the problem is when several user register at same time and click "SAVE" button at same time..
while 1 user register if another user click Signup from different computer or place it'll get same ID for both user...
How to avoid this problem...?please give some idea..