Google Map Current Loacatation

Copy the Code And Past in Aspx Page and Run You Find the Current Locatation
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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default3.aspx.cs" Inherits="Default3" %>

<!DOCTYPE html>
<html>
    <head>
        <script src="http://maps.google.com/maps/api/js?sensor=false">
        </script>
        <script>
            if (navigator.geolocation) {
                navigator.geolocation.getCurrentPosition(showCurrentLocation);
            }
            else {
                alert("Geolocation API not supported.");
            }

            function showCurrentLocation(position) {
                var latitude = position.coords.latitude;
                var longitude = position.coords.longitude;
                var coords = new google.maps.LatLng(latitude, longitude);

                var mapOptions = {
                    zoom: 15,
                    center: coords,
                    mapTypeControl: true,
                    mapTypeId: google.maps.MapTypeId.ROADMAP
                };

                //create the map, and place it in the HTML map div
                map = new google.maps.Map(
                document.getElementById("mapPlaceholder"), mapOptions
                );

                //place the initial marker
                var marker = new google.maps.Marker({
                    position: coords,
                    map: map,
                    title: "Current location!"
                });
            }
        </script>
    </head>
    <style>
    #mapPlaceholder {
        height: 400px;
        width: 700px;
    </style>
    <body>
        <div>
        <h2>HTML5 Show Location on GoogleMap Sample</h2>
        <div id="mapPlaceholder"></div>
        </div>
    </body>
</html>