Multiple Markers for Google Maps API V3 With Literal Asp.Net Control-Collection of common programming errors

I am using the following code to add Marker in Google Maps (API V3) , I use XML file for store locations

 protected void Page_Load(object sender, EventArgs e)
        {
            string locations = "";
            string lastlat = "", lastlng = "";

            XDocument xmlDoc = XDocument.Load(Server.MapPath("~/App_Data/Map.xml"));
            var query = from st in xmlDoc.Descendants("Position")
                        select st;

            foreach (var p in query)
            {
                lastlat = p.Element("Latitude").Value;
                lastlng = p.Element("Longitude").Value;
                locations += "var marker = new google.maps.Marker({position: new google.maps.LatLng(" 
                    + p.Element("Latitude").Value + "," 
                    + p.Element("Longitude").Value + "),info:\"" 
                    + p.Element("Name").Value + "\",title:\""
                    + p.Element("Name").Value + "\",map: map});marker.setMap(map)";
            }
            Label1.Text = locations;
            js.Text = @"function initialize() { var myLatlng = new google.maps.LatLng(" + lastlat + "," + lastlng + "); var myOptions = {zoom: 16, center: myLatlng, mapTypeId: google.maps.MapTypeId.ROADMAP } var map = new google.maps.Map(document.getElementById('map'), myOptions);" + locations + "marker.setMap(map);}";
        }

and this code

but do not show map in webpage!!!

This gives two error

   Uncaught SyntaxError: Unexpected token var
    Uncaught ReferenceError: initialize is not defined