vb.net ToolTip
===

I am trying to work in the tooltip in vb.net. What I am trying to do is whatever I  write the text in the textbox control show it in the tooltip. I am able to show text in tooltip but my question is when I edit input text it will show old and new text in the popup tooltip. Here is what I have done so far. 



Public Class Form1
    Dim s As String = ""

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        s = TextBox1.Text
        Dim tooltip1 As System.Windows.Forms.ToolTip = New System.Windows.Forms.ToolTip()
       
        tooltip1.SetToolTip(Button1, s)
    End Sub
End Class

Thank you.