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asp Google Map

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Last Modified: 2018-02-06
hi
i have created a web form frm_map.aspx structured as below:
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Frm_Map.aspx.vb" Inherits="Frm_Map" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>Google Maps Example</title>
     <script type="text/javascript"
        src="http://www.google.com/jsapi?key=AIzaSyDtWpEfoVxSKPTzKKFmYq1RP-isfqWLFGA"></script>
     <script type="text/javascript">
         google.load("maps", "2");
         // Call this function when the page has been loaded
         function initialize() {
             var map = new google.maps.Map2(document.getElementById("map"));
             map.setCenter(new google.maps.LatLng("<%=lat%>", "<%=lon%>"), 5);
        var point = new GPoint("<%=lon%>", "<%=lat%>");
          var marker = new GMarker(point);
          map.addOverlay(marker);
          map.addControl(new GLargeMapControl());
      }
      google.setOnLoadCallback(initialize);
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <div id="map" style="width: 400px; height: 400px"></div>
    </div>
    </form>
</body>

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below is it code behind :
Imports System.Data
Imports System.Net

Partial Class Frm_Map
    Inherits System.Web.UI.Page
    Protected lat As String, lon As String
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
        Dim ipaddress As String
        ipaddress = Request.ServerVariables("HTTP_X_FORWARDED_FOR")
        If ipaddress = "" OrElse ipaddress Is Nothing Then
            ipaddress = Request.ServerVariables("REMOTE_ADDR")
        End If
       
        lat = "33.55"
        lon = "55.45"
       
    End Sub

    
End Class

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after running this form i am getting the below error message
his page didn't load Google Maps correctly. See the JavaScript console for technical details.

below is the attach erroe
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