Send Message: KeyDown, KeyUp to an Application?

[VBbbq]

Been searching for awhile on how to do this...

Question:

How do you make Visual Basic (2010) Send Message: KeyDown, KeyUp to an Application?

Note: SendKeys.Send("{Down}") etc. won't work.

Example Script: (This Works, But Only Does Key Press Events)

    Private Sub Timer2_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer2.Tick
        Try
            AppActivate(1612) ' App ID
            SendKeys.Send("{" & C1.Text & "}") ' Keys To Send
        Catch ' Error Handling
            MsgBox(ErrorToString) ' Error Message If Any
        End Try
    End Sub

Any Help Would Be Greatly Appreciated, Thanks