mysql - Error when updating value at SQL database -


i want updating data @ database sql vb.net. i'm facing problem. more specific, data updated when barcode textbox same @ datagridview column. here's code

    private sub nharga_textchanged(byval sender system.object, byval e      system.eventargs) handles nharga.textchanged     if cbarcode.text <> ""         dim isi integer         isi = me.datagridview1.currentrow.index         datagridview1.rows.item(isi)             if .cells(0).value = cbarcode.text                 try                     dim cmd new mysqlcommand("update transaksi_sementara set jumlah = jumlah + 1 barcode = '" & cbarcode.text & "'", dbkon)                     dbreader.close()                     if cmd.executenonquery = 1                         call bersih()                         call tampil()                     end if                 catch ex exception                     msgbox(ex.message, msgboxstyle.critical)                 end try             else                 try                     dim cmd new mysqlcommand("insert transaksi_sementara values('" & cbarcode.text & "','" & cnamabarang.text & "','1','" & nharga.text & "','" & nharga.text & "')", dbkon)                     dbreader.close()                     if cmd.executenonquery = 1                         call bersih()                         call tampil()                     end if                 catch ex exception                     msgbox(ex.message, msgboxstyle.critical)                 end try             end if         end     end if end sub


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