To implement the Google Maps in Asp.Net with Demo you need to follow the below steps :
Step1 :
Create a new Asp.net website in Visual Studio and write the following html code in the design part of the Default.aspx page.
Source Code : 
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
             
 
Step2:
   
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
  
<script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false"></script>
<script language="javascript" type="text/javascript">
   
var directionsDisplay;
   
var directionsService = new
google.maps.DirectionsService();
   
function show() {
       
var tableid = document.getElementById('tbgetdirection'); 
       
tableid.style.display = 'block';    
   
}
   
function InitializeMap() {
       
directionsDisplay = new google.maps.DirectionsRenderer();
       
var latlng = new google.maps.LatLng(17.425503,
78.47497);
       
var myOptions1 =
       
{
           
zoom: 13,
           
center: latlng,
           
mapTypeId: google.maps.MapTypeId.ROADMAP
       
};
       
var map = new
google.maps.Map(document.getElementById("map"), myOptions1);
       
directionsDisplay.setMap(map);
       
directionsDisplay.setPanel(document.getElementById('directionpanel'));
       
var control = document.getElementById('control');
       
control.style.display = 'block';
   
}
   
function calcRoute() {
       
InitializeMap();
       
var start = document.getElementById('startvalue').value;
       
var end = document.getElementById('endvalue').value;
       
var request = {
           
origin: start,
           
destination: end,
           
travelMode: google.maps.DirectionsTravelMode.DRIVING
       
};
       
directionsService.route(request, function
(response, status) {
           
if (status == google.maps.DirectionsStatus.OK) {
  
             directionsDisplay.setDirections(response);
           
}
       
});
   
}
   
function Button1_onclick() {
       
calcRoute();
       
window.onload = InitializeMap;
       
var directiondiv = document.getElementById('directionpanel');
       
directiondiv.style.display = 'block';
       
}
   
window.onload = InitializeMap;
   
var map;
   
var geocoder;
   
function InitializeMap1() {
       
var latlng = new
google.maps.LatLng(17.425503, 78.47497);
       
var myOptions =
       
{
           
zoom: 13,
           
center: latlng,
           
mapTypeId: google.maps.MapTypeId.ROADMAP,
           
disableDefaultUI: true
       
};
       
map = new google.maps.Map(document.getElementById("map"),
myOptions);
   
}
   
function FindLocaiton() {
       
geocoder = new google.maps.Geocoder();
       
InitializeMap1();
       
var address = document.getElementById("addressinput").value;
       
geocoder.geocode({ 'address': address }, function
(results, status) {
           
if (status == google.maps.GeocoderStatus.OK) {
               
map.setCenter(results[0].geometry.location);
               
var marker = new google.maps.Marker({
                   
map: map,
                   
position: results[0].geometry.location
               
});
           
}
           
else {
               
alert("Geocode was not successful for the following reason:
" + status);
           
}
       
});
   
}
   
function Button2_onclick() {
       
FindLocaiton();
       
window.onload = InitializeMap1;
       
var tableid = document.getElementById('tbgetdirection');
       
tableid.style.display = 'none';
       
var directiondiv = document.getElementById('directionpanel');
       
directiondiv.style.display = 'none';
   
}
</script>
</head>
<body>
   
<form id="form1" runat="server">
<table>
<tr><td>
   
<input id="addressinput" type="text" style="width: 447px" />  
</td><td>
   
<input id="Button2" type="button" value="Search" onclick="return
Button2_onclick()"/>
<br />
</td></tr>
</table>
   
<div>
   
<table id ="control">
<tr><td>
<input id="Button3" type="button" value="GetDirections" onclick="show()" /></td>
</td></tr>
<tr><td>
<table id="tbgetdirection" style="display:none;">
<tr>
<td>From:</td>
<td>
   
<input id="startvalue" type="text" style="width: 305px" /></td>
</tr><tr>
<td>To:</td>
<td><input id="endvalue" type="text" style="width: 301px" /></td>
</tr><tr>
<td align ="right">
   
<input id="Button1" type="button" value="Go" onclick="return
Button1_onclick()" /></td>
</tr>
</table>
</td></tr>
<tr>
<td valign ="top">
<div id ="directionpanel" 
style=" display:none; height: 390px;overflow: auto" ></div>
</td>
<td valign ="top">
<div id ="map" style="height: 390px; width: 654px"></div>
</td></tr>
</table>
    </div>
   
</form>
</body>
</html>  
 
 
