ASP.net(C#)里界面代码里使用代码里变量的方法

public partial class _Default : System.Web.UI.Page
{
    netcommand.net ncom = new netcommand.net();
    public string du = "ffffffffffffffffffffffffffffffffffffffffffffff";
    protected void Page_Load(object sender, EventArgs e)
    {
        //NetCommand.net ncom = new NetCommand.net();
       
    }
}

<title><%=du%></title>