How to pass valu to java srcipt through .aspx.cs file

function initialize() {
      var lat =?;
      var lon = ?;
      var myLatlng = new google.maps.LatLng(lat, lon) // This is used to center the map to show our markers
      var mapOptions = {
          center: myLatlng,
          zoom: 6,
          mapTypeId: google.maps.MapTypeId.ROADMAP,
          marker: true
      };
      var map = new google.maps.Map(document.getElementById("map_canvas"), mapOptions);
      var marker = new google.maps.Marker({
          position: myLatlng
      });
      marker.setMap(map);
  }