Introduction

In this post, I explain how to Show Markers(Location) in Google Map dynamically from a database in ASP.NET.

 In this example, I am showing hotels in Digha.

Steps :

Step - 1: Create New Project.

Go to File > New > Project > Select asp.net web forms application > Entry Application Name > Click OK.

Step-2: Add a Database.

Go to Solution Explorer > Right Click on App_Data folder > Add > New item > Select SQL Server Database Under Data > Enter Database name > Add.

Step-3: Create a table and insert data for show Hotels in Google MAP.

Open Database > Right Click on Table > Add New Table > Add Columns > Save > Enter table name > Ok.

Step-4: Add Entity Data Model.

Go to Solution Explorer > Right Click on Project name form Solution Explorer > Add > New item > Select ADO.net Entity Data Model under data > Enter model name > Add.
A popup window will come (Entity Data Model Wizard) > Select Generate from database > Next >
Chose your data connection > select your database > next > Select tables > enter Model Namespace > Finish.

Step-5: Add a GMaps.dll Reference.

Download GMaps.dll


Right Click on references under project folder > Add Reference > Browse > Select GMaps.dll > OK.

Step-6: Add a Webpage and Design for Show hotels into Map.

Go to Solution Explorer > Right Click on Project name form Solution Explorer > Add > New item > Select web form/ web form using master page under Web > Enter page name > Add.

Add this line at the top of your page (design page) for register GMap control.

<%@ Register Assembly="GMaps" Namespace="Subgurim.Controles" TagPrefix="cc1" %>

<h3>Hotels in Digha</h3>
<div>
    <cc1:GMap ID="GMap1" runat="server" Width="800px" Height="500px"/>
</div>

Step-7: Write code for Show Maps.

Write the followings code in Page_Load event for Show Hotels in Google Maps.

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        // Here I used Degha Location as Main Location and Lat Long is : 21.622564, 87.523417
        GLatLng mainLocation = new GLatLng(21.622564, 87.523417);
        GMap1.setCenter(mainLocation, 15);

        XPinLetter xpinLetter = new XPinLetter(PinShapes.pin_star, "H", Color.Blue, Color.White, Color.Chocolate);
        GMap1.Add(new GMarker(mainLocation, new GMarkerOptions(new GIcon(xpinLetter.ToString(), xpinLetter.Shadow()))));

        List<HotelMaster> hotels = new List<HotelMaster>();
        using (MyDatabaseEntities dc = new MyDatabaseEntities())
        {
            hotels = dc.HotelMasters.Where(a => a.HotelArea.Equals("Digha")).ToList();
        }

        PinIcon p;
        GMarker gm;
        GInfoWindow win;
        foreach (var i in hotels)
        {
            p = new PinIcon(PinIcons.home, Color.Cyan);
            gm = new GMarker(new GLatLng(Convert.ToDouble(i.LocLat), Convert.ToDouble(i.LocLong)),
                new GMarkerOptions(new GIcon(p.ToString(), p.Shadow())));

            win = new GInfoWindow(gm, i.HotelName + " <a href='"+i.ReadMoreUrl+"'>Read more...</a>", false, GListener.Event.mouseover);
            GMap1.Add(win);
        }
    }
}

Step-8: Run Application.