Force TextBox Values to Capital Letters whatever user types in ASP.NET

Create a css class with the following definition and apply the cssclass to the Textbox. 

1:  .MakeCapsStyle{text-transform: uppercase;}

OR

.MakeCapsStyle{text-transform: uppercase;}

<asp:textbox id=”id” runat=”server”

cssclass=”MakeCapsStyle”>

</asp:textbox>