Lista D

Public Class Form1

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        If CInt(txtv1.Text) > 0 Then
            ListBox1.Items.Add(txtv1.Text)
            X += 1
        Else
            Button1.Enabled = False
            ListBox1.Sorted = True
            MsgBox(X)
            MsgBox(ListBox1.Items.ItemCount - X)

        End If

    End Sub
    Dim X As Integer = ListBox1.Items.ItemCount - 1
End Class