public string[,] routelist()
        {
            SqlCommand uno = new SqlCommand("SELECT COUNT(*) from rutas", link);
            SqlCommand dos = new SqlCommand("SELECT Clave,nombre from rutas", link);
            int registros;
            SqlDataReader r1, r2;
            link.Open();
            r1 = uno.ExecuteReader();
            r1.Read();
            registros = Convert.ToInt32(r1.GetValue(0));
            string[,] route = new string[registros, 1];
            link.Close();
            link.Open();
            r2 = dos.ExecuteReader();
            int d1 = 0;
            while (r2.Read())
            {
                route[d1, 0] = r2.GetValue(0).ToString();
                d1++;
            }
            link.Close();
            return route;
        }