Trasteando con Visual Basic 2010 express listbox

Botón para cargar datos en un listbox

Public Class Form1

Private Property EntryCount As Object

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
 ListBox1.Items.Add(TextBox1.Text) 'incluir el valor textbox1
 TextBox1.Clear() 'vaciar luego
 End Sub

End Class