Route directions are not displaying in google maps asp.net

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ASP.NET

Javascript

Google-Maps

I've a form with three fields hospital name,city & Your Location when the user hits submit button, he navigates to a new page displaying map along with directions. Route directions are not displaying. I'm unable to figure out mistake.Any help will be appreciated.

CSS:

html,
body,
#container {
  margin: 0;
  padding: 0;
  height: 700px;
  width: 1350px;
}
#sidebar {
  float: right;
  width: 250px;
  height: 100%;
  background: white;
  border: 0px solid #DDD;
  overflow: auto;
  overflow-x: hidden;
  z-index: 30;
  box-shadow: -1px 1px 3px -1px #000;
}
#map-canvas {
  float: left;
  width: 1100px;
  height: 700px;
}
.row {
  padding: 10px;
}
.separator {
  width: 96%;
  height: 1px;
  margin: 0 auto;
  border-bottom: 1px solid black;
}
label {
  font: 12px/14px Arial, Helvetica, sans-serif;
  font-weight: bold;
}

JS:

< script src = "http://maps.googleapis.com/maps/api/js??key=AIzaSyBcM1JmHJLyPH6m5xF0WzrqWJ9pSjCTQR4&sensor=false" / >
<script>
var loc = '<%= Session["hname"] %>';
var city = '<%= Session["city"] %>';
var userloc = '<%= Session["userloc"] %>';
var locations = [loc + city];
var geocoder;
var map;
var marker;
var markersArray = [];
var bounds;
var array = [];
var directionsDisplay;
var directionsService;

function initialize() {
  geocoder = new google.maps.Geocoder();
  bounds = new google.maps.LatLngBounds();
  latlang = geocoder.geocode({
    'address': userloc
  }, function(results, status) {
    if (status == google.maps.GeocoderStatus.OK) {
      map.setCenter(results[0].geometry.location);
      array.push([results[0].geometry.location, results[0].geometry.location]);
      var contentString = '<div id="content">' +
        'Lat :' + results[0].geometry.location.lat() + '</br>lng :' + results[0].geometry.location.lng() +
        '</div>';
      var infowindow = new google.maps.InfoWindow({
        content: contentString
      });
      marker = new google.maps.Marker({
        map: map,
        position: results[0].geometry.location,
        title: results[0].geometry.location.lat() + ' , ' + results[0].geometry.location.lng()

      });
      google.maps.event.addListener(marker, 'click', function() {
        infowindow.open(map, marker);
      });
      bounds.extend(results[0].geometry.location);
      map.fitBounds(bounds);
      markersArray.push(marker);


    } else {
      alert("Geocode was not successful for the following reason: " + status);
    }
  });
  var myOptions = {
    center: latlang,
    zoom: 17,
    mapTypeId: google.maps.MapTypeId.ROADMAP,
    navigationControlOptions: {
      style: google.maps.NavigationControlStyle.SMALL
    }
  };
  directionsService = new google.maps.DirectionsService();
  directionsDisplay = new google.maps.DirectionsRenderer();
  map = new google.maps.Map(document.getElementById("map-canvas"),
    myOptions);
  directionsDisplay.setMap(map);
  directionsDisplay.setPanel(document.getElementById('sidebar'));
  var request = {
    origin: userloc,
    destination: loc,
    travelMode: google.maps.DirectionsTravelMode.DRIVING
  };

  directionsService.route(request, function(response, status) {
    if (status == google.maps.DirectionsStatus.OK) {
      directionsDisplay.setDirections(response);

    }

  });
}

function plotMarkers() {
  for (var i = 0; i < locations.length; i++) {

    codeAddresses(locations[i]);
  }
  directionsService = new google.maps.DirectionsService();
  var directionsDisplay = new google.maps.DirectionsRenderer();
  map = new google.maps.Map(document.getElementById('map-canvas'), {
    zoom: 7,
    mapTypeId: google.maps.MapTypeId.ROADMAP
  });

  directionsDisplay.setMap(map);
  var request = {
    origin: userloc,
    destination: loc,
    travelMode: google.maps.DirectionsTravelMode.DRIVING
  };

  directionsService.route(request, function(response, status) {
    if (status == google.maps.DirectionsStatus.OK) {
      directionsDisplay.setDirections(response);
    }
  });
}

function codeAddresses(address) {
  geocoder.geocode({
    'address': address
  }, function(results, status) {
    if (status == google.maps.GeocoderStatus.OK) {
      map.setCenter(results[0].geometry.location);
      array.push([results[0].geometry.location, results[0].geometry.location]);
      var contentString = '<div id="content">' +
        'Lat :' + results[0].geometry.location.lat() + '</br>lng :' + results[0].geometry.location.lng() +
        '</div>';

      var infowindow = new google.maps.InfoWindow({
        content: contentString
      });
      marker = new google.maps.Marker({
        map: map,
        position: results[0].geometry.location,
        title: results[0].geometry.location.lat() + ' , ' + results[0].geometry.location.lng()

      });
      google.maps.event.addListener(marker, 'click', function() {
        infowindow.open(map, marker);
      });
      bounds.extend(results[0].geometry.location);
      map.fitBounds(bounds);
      markersArray.push(marker);
    } else {
      alert("Geocode was not successful for the following reason: " + status);
    }
  });
}

google.maps.event.addDomListener(window, 'load', initialize);
< /script>

HTML:

<!DOCTYPE html>

<body onload="initialize()">
  <form id="form2" runat="server">
    <div id="container">
      <div id="map-canvas">
        <div id="sidebar">
          <label>Get Directions</label>
          <div class="separator"></div>
          <div id="divDirections">

          </div>

        </div>
      </div>
    </div>
  </form>
</body>

</html>