Stack overflow

Dim con As New OleDbConnection("Provider=Microsoft.jet.oledb.4.0;data                   source=P:\POS System\POS System Database.mdb")
Dim cmd As OleDbCommand = New OleDbCommand("SELECT * FROM Login Info WHERE Username = 'user" & txtStaffID.Text & "' AND password = 'user" & txtPassword.Text & "' ", con)
con.Open()
Dim sdr As OleDbDataReader = cmd.ExecuteReader()
If (sdr.Read() = True) Then
'Pass verification and go to main form.
Me.Hide()
Else
MsgBox("Sorry, The Username or Password was incorrect.", MsgBoxStyle.Critical, "Information")
End If