protected void Button1_Click(object sender, EventArgs e)
        {
            var rand = new Random();

            var Aufgabe = new MyToDos()
            {
                Bezeichnung = TextBox1.Text,
                Datum       = DateTime.Now.AddSeconds(rand.Next(31536000))
            };
            var db = new DbTodo();

            db.MyToDos.Add(Aufgabe);
            db.SaveChanges();
            DataBind();
        }
        protected void TodoListView_ItemCommand(object source, ListViewCommandEventArgs e)
        {
            switch (e.CommandName)
            {
            case "del":
                var id = e.CommandArgument;
                //sql delete

                var db = new DbTodo();

                db.MyToDos.Remove(db.MyToDos.Find(id));
                //var del = new MyToDos() { Id = (int)id };
                //db.MyToDos.Remove(del);
                db.SaveChanges();
                break;

            default:
                break;
            }
        }