dodawanie klawisza pod funkcje w Visual Basic

[refax3]

Siema tak jak w temacie, nie wiem jak to zrobić o to kod:

Public Class Form1 

Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load 

End Sub 

Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click 
Timer1.Start() 
End Sub 

Private Sub Timer1_Tick(sender As System.Object, e As System.EventArgs) Handles Timer1.Tick 
SendKeys.Send(TextBox1.Text) 
SendKeys.Send("{ENTER}") 
End Sub 

Private Sub Button2_Click(sender As System.Object, e As System.EventArgs) Handles Button2.Click 
Timer1.Stop() 
End Sub 

End Class

chodzi mi o to by dodać startowanie i stopowanie spamowania pod klawisze, ktoś wie jak to zrobić?