Crea un formulario con tres marcos, una caja de texto, dos botones de opción, una caja de lista, cuatro botones y escribe el siguiente código:

Haz doble clic en el formulario y escribe:

Private Sub Form_Unload(Cancel As Integer)

If MsgBox("¿Cerramos el Programa?", vbQuestion + vbYesNo, "¿Ya nos Vamos?") = vbYes Then

End

Else: Cancel = True: Text1.SetFocus

End If

End Sub

El botón Agregar

Private Sub Command1_Click()

If IsNumeric(Text1.Text) Then

List1.AddItem Text1.Text

Text1.Text = ""

Text1.SetFocus

Else

MsgBox "Introduce un Número", vbCritical, "Por Favor"

Text1.SelStart = 0

Text1.SelLength = Len(Text1.Text)

Text1.SetFocus

End If

End Sub

El botón Ordenar

Private Sub Command2_Click()

Dim i As Integer, j As Integer, t As Integer, n As Integer

Dim a() As Integer

n = List1.ListCount

ReDim a(n)

For i = 0 To n - 1

a(i) = List1.List(i)

Next i

If Option1.Value Then

For i = 0 To n - 2

For j = i + 1 To n - 1

If a(i) > a(j) Then

t = a(i)

a(i) = a(j)

a(j) = t

End If

Next j

Next i

End If

Text1.SetFocus

If Option2.Value Then

For i = 0 To n - 2

For j = i + 1 To n - 1

If a(i) < a(j) Then

t = a(i)

a(i) = a(j)

a(j) = t

End If

Next j

Next i

End If

List1.Clear

For i = 0 To n - 1

List1.List(i) = a(i)

Next i

Text1.SetFocus

End Sub

El botón Lista Nueva

Private Sub Command4_Click()

Text1 = ""

List1.Clear

Text1.SetFocus

End Sub

El botón Salir

Private Sub Command3_Click()

If MsgBox("¿Seguro que Quieres Cerrar el Programa?", vbQuestion + vbYesNo, "¿Ya es Hora de Irnos?") = vbYes Then

End

Else: Cancel = True: Text1.SetFocus

End If

End Sub