Problem:
Trying to concatenate user Last name, first name and Middle name in an Hyperlink control using inline binding.
Solution:
Use the String.Format
<asp:HyperLink ID="HyperLink1" NavigateUrl='
<%#String.Format("Default.aspx?assignment={0}",Eval("dispname")) %>' runat="server">
<%# String.Format("{0} {1} {2}", Eval("lastname"), Eval("firstname"), Eval("midinitial"))%>
</asp:HyperLink>