ทำไมผม update ข้อมูลใหม่ลงฐานข้อมูลไม่ได้ครับ รบกวนดู code ให้ที

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace coop2
{
    public partial class EditNews : System.Web.UI.Page
    {
        DataClasses1DataContext db = new DataClasses1DataContext();
        private New databind()
        {
            int lblid = Convert.ToInt32(Request.QueryString["id"]);
            New n = (from nus in db.News where nus.News_Id == lblid select nus).FirstOrDefault();
            return n;     
        }
        protected void Page_Load(object sender, EventArgs e)
        {
            New ns = databind();
            TextBox1.Text = ns.News_Header;
            TextBox2.Text = ns.News_Detail;
            TextBox3.Text = ns.News_Img;
            TextBox4.Text = ns.News_Date;
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            New ns = databind();
            ns.News_Header = TextBox1.Text;
            ns.News_Detail = TextBox2.Text;
            if (System.IO.Path.GetFileName(FileUpload1.PostedFile.FileName) == "")
            {
                ns.News_Img = TextBox3.Text;
            }
            else
            {
                string filename = System.IO.Path.GetFileName(FileUpload1.PostedFile.FileName);
                FileUpload1.SaveAs(Server.MapPath("img/" + filename));
                ns.News_Img = "img/" + filename;
            }
            ns.News_Date = TextBox4.Text;
            db.SubmitChanges();
        }

        protected void Button2_Click(object sender, EventArgs e)
        {
            Response.Redirect("ManageNews.aspx");
        }
    }
}