How to trap when student is already log in or log out of the event, using Vb.net 2008 -


this code button 

private sub button1_click(byval sender system.object, byval e system.eventargs) handles button1.click     user = 1     if textbox1.text <> ""         dim namemo string = ""         executequery("select * tbl_student id='" & textbox1.text & "'")         if reader.hasrows             try                 while reader.read                     namemo = reader.item("lname") & ", " & reader.item("fname") & " " & reader.item("mi") & "."                 end while             catch ex exception             end try             call disconnectdb()              'for logging in             if logstatus = 1                 executequery("select * tbl_log studid='" & textbox1.text & "' , eventid=" & realid)                 if reader.hasrows                     call disconnectdb()                     executequery("update tbl_log set  timein='" & now.hour & ":" & now.minute & "' studid='" & textbox1.text & "' , eventid='" & realid & "'")                     call disconnectdb()                 else                     call disconnectdb()                     executequery("insert tbl_log set studid='" & textbox1.text & "',eventid='" & realid & "', timein='" & now.hour & ":" & now.minute & "'")                     call disconnectdb()                 end if                 msgbox("hi " & strconv(namemo, vbstrconv.uppercase) & " login", msgboxstyle.information, "information")                 call disconnectdb()                  'for logging out             elseif logstatus = 2                 executequery("select * tbl_log studid='" & textbox1.text & "' , eventid=" & realid)                 if reader.hasrows                     call disconnectdb()                     executequery("update tbl_log set  timeout='" & now.hour & ":" & now.minute & "' studid='" & textbox1.text & "' , eventid='" & realid & "'")                     call disconnectdb()                 else                     call disconnectdb()                     executequery("insert tbl_log set studid='" & textbox1.text & "',eventid='" & realid & "', timeout='" & now.hour & ":" & now.minute & "'")                     call disconnectdb()                 end if                 msgbox("hi " & strconv(namemo, vbstrconv.uppercase) & " logged out.", msgboxstyle.information, "information")             end if             textbox1.clear()         else             msgbox("sorry " & textbox1.text & " id number not valid!", msgboxstyle.exclamation, "error")         end if         call disconnectdb()         '  textbox1.clear()         textbox1.focus()     end if     user = 0 end sub


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