I'm facing the same problem. U said its due to having the wrong connect string. What the connection string you used.

my script is this. please help me. I don't have any web.config file. it would be very helpful if you give the solution.

<script runat="server">
sub OnBtnSendClicked (s As Object, e As EventArgs)
    Dim strConn as string = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & server.mappath("guestbook.mdb") & ";"
   
    Dim MySQL as string = "INSERT INTO Guestbook (Name, EMail, URL, Comment) VALUES ('" & txtName.Text & "','" & txtEMail.Text & "','" & txtURL.Text & "','" & txtComment.Text & "')"
    Dim MyConn as New OleDBConnection (strConn)
    Dim cmd as New OleDBCommand (MySQL, MyConn)
    MyConn.Open ()
    cmd.ExecuteNonQuery ()
    MyConn.Close ()
   
    Response.Redirect ("guestlog.aspx")
end sub

sub OnBtnClearClicked (s As Object, e As EventArgs)
    txtName.Text = ""
    txtEMail.Text = "yourname@somebody.com"
    txtURL.Text = "http://"
    txtComment.Text = ""
end sub
</script>