private void AdminHome_Load(object sender, EventArgs e)
        {
            AutoCompleteStringCollection coll = new AutoCompleteStringCollection();
            UpdateDBLin ul = new UpdateDBLin();

            List <string> li = ul.getAllUser();

            for (int i = 0; i < li.Count(); i++)
            {
                coll.Add(li.ElementAt(i).ToString());
            }

            textBox1.AutoCompleteCustomSource = coll;
        }