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constraint problemI had declare the keyconstraint.
Dim con_id_rv As ForeignKeyConstraint con_id_rv = New ForeignKeyConstraint("fk_id", dtInv.Columns("invno"), dtRv.Columns("invno")) However, I got one error Object reference not set to an instance of an object. Please help. Thanks a lot Why don't you put a breakpoint where you are creating the constraint, and
make sure all these objects aren't null. This would be the easiest and fastest way to fix the problem. Show quoteHide quote "Agnes" <ag***@dynamictech.com.hk> wrote in message news:%23X8kAZ7vGHA.4436@TK2MSFTNGP06.phx.gbl... >I had declare the keyconstraint. > Dim con_id_rv As ForeignKeyConstraint > con_id_rv = New ForeignKeyConstraint("fk_id", > dtInv.Columns("invno"), dtRv.Columns("invno")) > > However, I got one error > Object reference not set to an instance of an object. > > Please help. > Thanks a lot > > 
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