asp.net - SQL Insert NOT always creating row in table -


i have aspx.vb program checks table see if session exists , if not connects our ecm software, consumes license, , updates table sessions information. if user tries log in again should find existing session , still consume 1 license.

this works 99% of time except user consume 2 licenses creates 1 row in table, in turn leaves duplicate session caught in limbo , has manually disconnected release license.

i added logging , hitting code should , variables passing correct values. possible code running through logic fast before connection can established database? 

    lvsql = "insert onbase_sessions values (@dbseqnum,@sid,@uname,@lastactivity,@ccseqnum)"             x = new sqlcmds(lvsql, "onbaseapi")             x.addintparameter("@dbseqnum", sqldbtype.int, 4, lvdatasourceseq)             x.addstrparameter("@sid", sqldbtype.varchar, 40, lvsession)             x.addstrparameter("@uname", sqldbtype.varchar, 15, user.username)             x.addstrparameter("@lastactivity", sqldbtype.datetime, 0, system.datetime.now)             x.addintparameter("@ccseqnum", sqldbtype.int, 4, lvclientcodeseq)             x.exenonquery()

learned valuable lesson on importance of using private on public variable. :p


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