Session ind i opdatering af database

Jeg har en database, hvor brugerne skal kunne opdatere oplysninger! Men hvordan kan jeg sikre mig, at det kun er den bruger, der er logget ind, hvis data opdateres. 

<%
Response.Expires = -1000 'Makes the browser not cache this page
Response.Buffer = True 'Buffers the content so our Response.Redirect will work

If Session("UserLoggedIn") <> "true" Then
    Response.Redirect("login2.asp")
End If
%>


<%
if request.session("UserLoggedIn") <> "" then
STRDBNAVN="database\databaselog.mdb"
DSN = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Server.MapPath(""& STRDBdatabaselog & "") 
Set Conn = Server.CreateObject("ADODB.Connection") 
Conn.Open DSN
 
strSQL = strSQL & "navn= '" & request("navn") & "', "
strSQL = strSQL & "efternavn= '" & request("efternavn") & "', "
strSQL = strSQL & "adresse= '" & request("adresse") & "', "
strSQL = strSQL & "telefon= '" & request("telefon") & "', "
strSQL = strSQL & "email= '" & request("email") & "', "
strSQL = strSQL & "foedselsdag= '" & request("foedselsdag") & "', "
strSQL = strSQL & "civil stand= '" & request("civil stand") & "', "
strSQL = strSQL & "born= '" & request("born") & "', "
strSQL = strSQL & "password= '" & request("password") & "', "
strSQL = strSQL & "Where id=" & request("id")


Conn.Execute(strSQL)

Conn.Close
Set Conn = Nothing
end if
%>
<form method="post" action="opdater.asp">
<input type="text" name="navn" size="20">
<input type="text" name="efternavn" size="20">
<textarea rows="2" name="civil stand" cols="20"></textarea>
<input type="text" name="telefon" size="20">
<input type="text" name="foedselsdag" size="20">
<textarea rows="2" name="civil stand" cols="20"></textarea>
<textarea rows="2" name="born" cols="20"></textarea>
<textarea rows="2" name="arbejde" cols="20"></textarea>
<input type="text" name="password" size="20">
<input type="text" name="password2" size="20">
<input type="submit" name="send" value="send">
</form>