i am storing a usernames and passwords in a table called Users.

I present a login form to the user when my application starts up
(VB.NET, .NET CF, Windows Mobile 5)

The user chooses a username from a combo box that queries the Users
table. Then they type in a password string.

I then use the following code to validate the string when the user
clicks on the Submit menu item

Private Sub Submit_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Submit.Click
        vUserName = Me.UserCombo.Text 'set variable for use later in
the app
        'MsgBox(vUserName)

        Dim vPassword2 As String
        vPassword2 =
CStr(Me.UsersTableAdapter.GetPassword(UserDataSet.Users, vUserName))
        'MsgBox(vPassword2)

        If vPassword2 <> Me.UserPassword.Text Then
            MessageBox.Show("Login Failed. Please try again.",
"Login", MessageBoxButtons.OK, MessageBoxIcon.Exclamation,
MessageBoxDefaultButton.Button1)
            'refill the username list with all options
            Me.UsersTableAdapter.Fill(UserDataSet.Users)
        Else
            Dim frmMainMenu As New SystemMenu 'create the system menu
class
            frmMainMenu.Show()

        End If
    End Sub

I am not able to get this to compare and validate the password string.
any advice, comments or experience would be most appreciated.

Ryan