I have used the sample here and did little modifcations
ASP.Net : Google Maps V3 with Multiple Markers Database Example
HTML
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false"></script>
<script type="text/javascript">
var markers = [
<asp:Repeater ID="rptMarkers" runat="server">
<ItemTemplate>
{
"title": '<%# Eval("Name") %>',
"lat": '<%# Eval("Latitude") %>',
"lng": '<%# Eval("Longitude") %>',
"description": '<%# Eval("Description") %>'
}
</ItemTemplate>
<SeparatorTemplate>
,
</SeparatorTemplate>
</asp:Repeater>
];
</script>
<script type="text/javascript">
window.onload = function () {
for (i = 0; i < markers.length; i++) {
var mapOptions = {
center: new google.maps.LatLng(markers[0].lat, markers[0].lng),
zoom: 6,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var infoWindow = new google.maps.InfoWindow();
var map = new google.maps.Map(document.getElementById("dvMap" + (i + 1)), mapOptions);
var data = markers[i];
var myLatlng = new google.maps.LatLng(data.lat, data.lng);
var marker = new google.maps.Marker({
position: myLatlng,
map: map,
title: data.title
});
(function (marker, data) {
google.maps.event.addListener(marker, "click", function (e) {
infoWindow.setContent(data.description);
infoWindow.open(map, marker);
});
})(marker, data);
}
}
</script>
<asp:Repeater ID="rptMaps" runat="server">
<ItemTemplate>
<div id='dvMap<%# Container.ItemIndex + 1 %>' style="width: 400px; height: 200px">
</div>
</ItemTemplate>
<SeparatorTemplate>
<hr />
</SeparatorTemplate>
</asp:Repeater>
</form>
</body>
</html>
Code
protected void Page_Load(object sender, EventArgs e)
{
if (!this.IsPostBack)
{
DataTable dt = this.GetData("select * from Locations");
rptMarkers.DataSource = dt;
rptMarkers.DataBind();
rptMaps.DataSource = dt;
rptMaps.DataBind();
}
}
private DataTable GetData(string query)
{
string conString = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
SqlCommand cmd = new SqlCommand(query);
using (SqlConnection con = new SqlConnection(conString))
{
using (SqlDataAdapter sda = new SqlDataAdapter())
{
cmd.Connection = con;
sda.SelectCommand = cmd;
using (DataTable dt = new DataTable())
{
sda.Fill(dt);
return dt;
}
}
}
}
