Asp.Net Routing dynamic value problem

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ASP.NET

routing

Hi ,
I have a little problem.

My asax :

<%@ Import Namespace="System.Web.Routing" %>

<script runat="server">

    void Application_Start(object sender, EventArgs e) 
    {
        // Code that runs on application startup
      RouteTable.Routes.MapPageRoute("article_url_name", "article/{article_title}", "~/blog/article.aspx");
        

    }

My Default.aspx

<asp:Hyperlink ID="headerlink" CssClass="headerlnk" runat="server" NavigateUrl='<%  $RouteUrl:RouteName=article_url_name , article_title=#Eval("articlecontent")  %>'
     ><%# Eval("articlecontent") %></asp:Hyperlink>

this is not work. I can't get articlecontent in navigateUrl.

<asp:Hyperlink ID="headerlink" CssClass="headerlnk" runat="server" NavigateUrl='<%  $RouteUrl:RouteName=article_url_name , article_title=test  %>'
     ><%# Eval("articlecontent") %></asp:Hyperlink>

this link taking me to "blog/test"



where is the problem ? why can i get the dynamic content ?