var marker;
  for (var i = 0; i < ('<%= Buses.Count %>' - 1); i++) {
       marker = new google.maps.Marker({
       position: new google.maps.LatLng('<%= Buses['i'].latitude %>', '<%= Buses['i'].longitude  %>'),
        map: map
       });
  }

public static List<Bus> Buses = new List<Bus>();