[DotNetDevelopment] SqlServer smo and SQL Express

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I've been trying to make a mini backup app using smo on SQL express. I
m doing it in VS.2005.  Problem is I can connect the server but not
database. There is no error with the database object but when i try to
get tables count, it always return 0.
My code was like this :

Imports Microsoft.SqlServer.Management.Smo
Imports Microsoft.SqlServer.Management.Common

Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e
As System.EventArgs) Handles Button1.Click
        Dim m_connection As New
Data.SqlClient.SqlConnection(My.MySettings.Default.db1ConnectionString.Trim)
        Dim m_server As New Server(New ServerConnection(m_connection))
        Dim m_database As New Database(m_server, "db1.mdf")
        Me.TextBox1.AppendText(vbCrLf & m_server.Name) ' // returns DDG
\SQLEXPRESS
        Me.TextBox1.AppendText(m_server.VersionString) ' // returns
9.00.1399.06
        Me.TextBox1.AppendText(vbCrLf & m_database.Name) ' // returns
db1.mdf
        Me.TextBox1.AppendText(vbCrLf & "No. of tables: " &
m_database.Tables.Count) ' // returns 0. actually there are 2 tables
in the database.
    End Sub

Please help me.