Ensuring or validating that a student can only vote once using my voting system. -VB.Net -


i wanted have voting system registered student can vote once. have code used registered firstname , surname log-in access. can me guys on how possibly make student voted compromise his/her rights vote twice? thank you.

    private sub metrobutton2_click(sender object, e eventargs) handles metrobutton2.click     dim sql string      if firstname2metrotextbox.text = ""         msgbox("type in first name.")     elseif surnamemetrotextbox.text = ""         msgbox("type in surname.")     else          try             if firstname2metrotextbox.text = "" , surnamemetrotextbox.text = ""                 msgbox("first name , surname doesn't match.")             else                 sql = "select * student_registrants firstname = '" & firstname2metrotextbox.text & "' , surname = '" & surnamemetrotextbox.text & "'"                 cmd                     .connection = conn                     .commandtext = sql                 end                 timer1.start()                       da.dispose()             end if          catch ex exception             msgbox(ex.message)         end try         conn.clone()      end if end sub

and log-in voting form. after he/she picks his/her desired candidate, made code.

    private sub tileitem26_itemclick(sender object, e devexpress.xtraeditors.tileitemeventargs) handles confirmtileitem.itemclick     if presidentmetrolabel.text = ""         msgbox("choose next president.")     elseif vicepresidentmetrolabel.text = ""         msgbox("choose next vice president.")     elseif secretarymetrolabel.text = ""         msgbox("choose next secretary.")     elseif auditormetrolabel.text = ""         msgbox("choose next auditor.")     elseif senator1metrolabel.text = ""         msgbox("choose next senator(s).")     elseif senator2metrolabel.text = ""         msgbox("choose next senator(s).")     elseif senator3metrolabel.text = ""         msgbox("choose next senator(s).")     elseif senator4metrolabel.text = ""         msgbox("choose next senator(s).")      else         try             conn.connectionstring = ("server=localhost;user id=root;password=;database=university_election")             conn.open()             cmd                  .connection = conn                 .commandtext = "update `election_tally_presidents` set votes = votes + 1 president_id = '" & presidentint & "'; update `election_tally_vicepresidents` set votes = votes + 1 vicepresident_id = '" & vicepresidentint & "'; update `election_tally_secretary` set votes = votes + 1 secretary_id = '" & secretaryint & "'; update `election_tally_auditor` set votes = votes + 1 auditor_id = '" & auditorint & "'; update `election_tally_senators` set votes = votes + 1 senator_id = '" & senator1int & "'; update `election_tally_senators` set votes = votes + 1 senator_id = '" & senator2int & "'; update `election_tally_senators` set votes = votes + 1 senator_id = '" & senator3int & "'; update `election_tally_senators` set votes = votes + 1 senator_id = '" & senator4int & "';"                 result = cmd.executenonquery                 timer1.start()                 metroprogressbar1.show()                 metrolabel1.visible = true                end         catch ex exception             msgbox("cannot register database: " & ex.message)                     conn.dispose()          end try        end if end sub

so what's code best fit system? thank you.


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