As it is not possible to use the font awesome in the Asp:Button. I came across to use the Font Awesome cheat sheet from the comment in this post as follows:
<asp:Button ID="btEdit" runat="server" CssClass="btn fa" Text="">
</asp:Button>
But now, Text="" looks so awkward. Is there some way to use constants, so use like this, Text="edit" and edit has the value  
 
     
    