How Can I Pause/Stop Sapi In Vb.Net?

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VB

I have created this program which loads a file into a rich textbox and sapi reads it from the richtextbox. Now, everything works as intended but now my goal is to pause / stop the reading using play/pause buttons. I am unable to do this and sapi keeps reading untill it gets done. I dont know where the problem is. I was looking online for some solutions and tried one of them but it dint seem to work.(https://www.daniweb.com/software-development/vbnet/threads/418673/microsoft-speech-api[^]

Here is my code:-

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
       

        Me.RichTextBox1.LoadFile("c:\temp\Commands.txt", RichTextBoxStreamType.PlainText)

End sub

Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click

        sapi.speak(RichTextBox1.Text)
        


    End Sub

 Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click

      
        sapi.pause()

End Sub

How do i resolve this issue? Please help me out. Thanks