在vs2015中无法在Windows 10上捕获用户身份

Question

我正在尝试捕获用户身份但无法捕获它。 我打开或关闭Windows功能并更新Windows身份验证， 但仍然无法捕获登录ID。 任何想法都将不胜感激。

c＃c​​ode

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        string uid = "";

        try { uid = Session["uid"].ToString(); }
        catch { uid = ""; }

        if (uid == "" || uid == null)
        {
            uid = Page.User.Identity.Name;  
            if (uid.Length > 0)
            {
                uid = uid.Substring(10);
            }
        }
    }
}