How to Delete particular cookie in asp.net C#

Question

my logout code are

   protected void Page_Load(object sender, EventArgs e)

    {

        //if (Request.Cookies["Prno"] != null)

        //{

        //    HttpCookie myCookie = new HttpCookie("Prno");

        //    myCookie.Value = String.Empty;

        //    myCookie.Expires = DateTime.Now.AddYears(-1);

        //    Response.Cookies.Add(myCookie);

        //    Response.Cookies.Remove("Prno");

        //}

        HttpCookie myCookie = new HttpCookie("Prno");

        //Here, we are setting the time to a previous time.

        //When the browser detect it next time, it will be deleted automatically.

        myCookie.Expires = DateTime.Now.AddDays(-1d);

        Response.Cookies.Add(myCookie);

        //Request.Cookies["Prno"].Expires = DateTime.Now;

        Session.Abandon();

        Session.Clear();

        Response.Cookies.Clear();

        Response.Redirect("~/Login.aspx");

    }

}