Line Feed On Button Text

I have an asp.net page with a button that I want to set the Text property to a multi-line text. I have tried below in both Page_Load and Page_PreRender but neither are working. How can I set the text to multi-line on a Button control?  Thanks.
Dim strText As String = "PUNCH OUT AND" & "<br />" & "FLAG FOR O.T." & "<br />" & "APPROVAL" BtnOT.Text = strText