.net connessione database sdf (pochet pc)

[amodio]

salve a tutti
avendo il database Ordini.sdf nella cartella \My Documents\Ordini

e inserrendo questo codice

    Public Percorso_FIle As String = "\My Documents\Ordini"
    Public strConn As String = " Data Source=" & Percorso_FIle & "\" & "Ordini.sdf" '"\My Documents\Rapportini\Rapportini.sdf"


    Dim Conn As New SqlServerCe.SqlCeConnection(strConn)
conn.open

 Dim Com As New SqlServerCe.SqlCeCommand
        Dim Res As SqlServerCe.SqlCeDataReader
        '   MsgBox("4")

        Com.CommandType = CommandType.Text
        Com.CommandText = "select * from Categorie "
        Com.Connection = Conn

proprio non riesco a connettermi al database
in cosa sbaglio?

grazie

[arkanda]

Dim Conn As New SqlServerCe.SqlCeConnection(strConn)
conn.open

Dim Com As New SqlServerCe.SqlCeCommand


Com.CommandText = "select * from Categorie "
Com.Connection = Conn
Dim Res As SqlServerCe.SqlCeDataReader =com.executereader(commandbehavior.closeconnection )

A me così funziona benissimo

Ciao
Antonio