I upgraded to 8.1 version today from my previous version 3.6 and found very strange behavior in my own web site. can some one check this issue on real time between the two versions and help me with suggestion? visit http://salesblast.net (in final stages of testing live). create a test drive account and work with cash discounts and this strange behavior can be noticed . in former case the rows will be added to grid and in later case new added row replaces the old row. just a wild guess that the problem in this new version is with session variables. i am using asp.net 3.5