synchronization of two database in asp.net

 protected void btnCheck_Click(object sender, EventArgs e)
        {
            WebClient client = new WebClient();
            byte[] datasize = null;
            try
            {
                datasize = client.DownloadData("http://www.google.com");
            }
            catch (Exception ex)
            {
            }
            if (datasize != null && datasize.Length > 0)
            {
                var List = DB.tbl_Contact.Where(p => p.IsOnline == false).ToList();
                foreach (Database.tbl_Contact item1 in List)
                {
                    var objtbl_Contact = DB.tbl_Contact.SingleOrDefault(p => p.ID == item1.ID);
                    objtbl_Contact.IsOnline = true;
                    DB.SaveChanges();
                }
                foreach (Database.tbl_Contact item in List)
                {
                    OnlineDB.tbl_Contact objtbl_Contact = new OnlineDB.tbl_Contact();
                    objtbl_Contact.Name = item.Name;
                    objtbl_Contact.Address = item.Address;
                    objtbl_Contact.Description = item.Description;
                    objtbl_Contact.EmailID = item.EmailID;
                    objtbl_Contact.MobileNo = item.MobileNo;
                    objtbl_Contact.City = item.City;
                    objtbl_Contact.State = item.State;
                    objtbl_Contact.CompanyName = item.CompanyName;
                    objtbl_Contact.WebSite = item.WebSite;
                    //if (Image.HasFile)
                    //{
                    //    Image.SaveAs(Server.MapPath("../Gallery/") + Image.FileName);
                    //    objtbl_Contact.Avtar = Image.FileName;
                    //}
                    objtbl_Contact.Remainder = DateTime.Now;
                    objtbl_Contact.IsOnline = true;

                    objtbl_Contact.Deleted = true;
                    objtbl_Contact.DateTime = DateTime.Now;
                    objtbl_Contact.CreatedBy = 1;
                    DB1.tbl_Contact.AddObject(objtbl_Contact);

                    DB1.SaveChanges();
                    lbltxt.ForeColor = System.Drawing.Color.Green;
                    lbltxt.Text = List.Count() + " Records Uploaded Successfully !!";
                    //ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), "MyScript", "alert('Uploaded Successfully !!');", true);
                }
            }
            else
            {
                lbltxt.ForeColor = System.Drawing.Color.Red;
                lbltxt.Text = "Internet Connection Not Available.";
            }
        }