Pass More Evals in QueryString with String.Formate

<asp:TemplateField HeaderText="EMail" SortExpression="EMail">
    <ItemTemplate> 

         <asp:HyperLink ID="hp" runat="server" 

                  CommandArgument='<%# Eval("SysID", "{0}") %>' 
       NavigateUrl='<%#  String.Format("~/ReportViewer.aspx?RevID= {0} 
      & User={1}", Eval("ID"),  Eval("USER")) %>' Target="_blank"  %>'>

</asp:HyperLink>

     </ItemTemplate>
</asp:TemplateField>