C#'da combobox'a veri tabanından gelen verileri listeleme

void  town_combox()
        {
            string sql_cmd = "SELECT  Town FROM land_register";
            connectionforwell.Open();
            MySqlCommand cmd = new MySqlCommand(sql_cmd, connectionforwell);
            MySqlDataReader read;
            try 
            {
                read = cmd.ExecuteReader();
                string test = read.GetString("Koy");
                while (read.Read())
                {
                    string myread = read.GetString("Koy");
                    if (test == myread)
                    { }
                    else
                    {
                        towncom1.Items.Add(myread);

                    }
                }
           
            }
            catch(Exception ex)
            {
                MessageBox.Show("Please, Check your db connection", "Data Base Problem", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);

            }
        }

if(!comboBox1.Items.Constains("Veri"))
{

}