Tạo Form đăng nhập Trong access vba

Private Sub txtdn_Click()

Dim db As DAO.Database

Dim rs As DAO.Recordset

Set db = CurrentDb()

Dim user, pass As String

user = Trim(txtuser.Value)

On Error Resume Next

pass = Trim(txtpass.Value)

Set rs = db.OpenRecordset("acount")

Dim tam As Integer

tam = 0

Do While rs.EOF = False

If rs!user = user And rs!pass = pass Then

    labela.Caption = "ban da dang nhap thanh cong"

    If MsgBox("Ok de vao thang chuong trinh", vbOKOnly + vbQuestion, "Thong bao!") = vbOK Then

    DoCmd.OpenForm "F_Khoi_Tao"

    DoCmd.Close acForm, "DANG_NHAP"

    End If

    tam = 1

    Exit Do

Else

    tam = 0

End If

    rs.MoveNext

Loop

If tam = 0 Then

    If dem <= 3 Then

        'MsgBox "Ban dang nhap sai Password hay Username", vbOKOnly + vbQuestion, "Thong bao!"

        labela.Caption = "Ban dang nhap sai Password hay Username"

        dem = dem + 1

        txtuser.Value = " "

        txtpass.Value = " "

        txtuser.SetFocus

    Else

        If MsgBox("Ban da dang nhap qua 3 lan", vbYesNo + vbQuestion, "Thong bao!") = vbOK Then

            DoCmd.Quit acQuitPrompt

        Else

        labela.Caption = "Ban da bi khoa chuong trinh"

        End If

        

    End If

End If

End Sub