asp.net - ASP Textbox CSS and Data Binding Expression Issue -


i have asp textbox , i'm trying add style caldatepicker along databinding expression within same cssclass attribute.

below example of code trying work. ideas?

<asp:textbox id="datevalue" cssclass='<%# showfieldrequired(eval("required"))%>  + "caldatepicker"' runat="server"></asp:textbox>

did try:

cssclass='<%# showfieldrequired(eval("required"))%> caldatepicker'

or: 

<asp:textbox id="datevalue" cssclass='<%# showfieldrequired(eval("required")) + " caldatepicker"%>' runat="server"></asp:textbox>

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