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Posted 18 Jan 2009

GMap.NET - Great Maps for Windows Forms and Presentation

, 16 Apr 2013
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GMap.NET is a powerful, free, cross platform, Open Source .NET control. It enables the use of routing, geocoding, and maps from Google, Yahoo!, OpenStreet in Windows Forms and Presentation, and supports caching!



Google Maps are cool, yeah? But it's useful only in the browser, and is insufficient for real time tracking. It also does not have cache so Google servers are overloaded. This control removes all these deficiencies! It also gives the .NET developer unlimited ability to extend it!

GMap.NET is great and Powerful, Free, cross platform, open source .NET control. Enable use routing, geocoding, directions and maps from Google, Yahoo!, Bing, OpenStreetMap, ArcGIS, Pergo, SigPac, Yandex,,,, NearMap, OviMap, CloudMade, WikiMapia, MapQuest in Windows Forms & Presentation, supports caching and runs on windows mobile! 


The basic idea is simple: get the required data from Google/etc., cache it, and use it. Fast, simple, and practical.

Using the Code

It's more than easy. GMap.NET.dll and GMap.NET.WindowsForms.dll contain the user control. Add it to your project and simply use it.

Here are the basic control initial options: 

public MainForm()


   System.Net.IPHostEntry e =
   MainMap.Manager.Mode = AccessMode.CacheOnly;
   MessageBox.Show("No internet connection avaible, going to CacheOnly mode.", 
         "GMap.NET - Demo.WindowsForms", MessageBoxButtons.OK,

// config map
MainMap.MapProvider = GMapProviders.OpenStreetMap;
MainMap.Position = new PointLatLng(54.6961334816182, 25.2985095977783);
MainMap.MinZoom = 0;
MainMap.MaxZoom = 24;
MainMap.Zoom = 9;

// add your custom map db provider
//GMap.NET.CacheProviders.MySQLPureImageCache ch = new GMap.NET.CacheProviders.MySQLPureImageCache();
//ch.ConnectionString = @"server=sql2008;User Id=trolis;Persist Security Info=True;database=gmapnetcache;password=trolis;";
//MainMap.Manager.SecondaryCache = ch;

// set your proxy here if need
//GMapProvider.WebProxy = new WebProxy("", 8080);
//GMapProvider.WebProxy.Credentials = new NetworkCredential("", "bilgeada");

// map events
   MainMap.OnPositionChanged += new PositionChanged(MainMap_OnPositionChanged);

   MainMap.OnTileLoadStart += new TileLoadStart(MainMap_OnTileLoadStart);
   MainMap.OnTileLoadComplete += new TileLoadComplete(MainMap_OnTileLoadComplete);

   MainMap.OnMapZoomChanged += new MapZoomChanged(MainMap_OnMapZoomChanged);
   MainMap.OnMapTypeChanged += new MapTypeChanged(MainMap_OnMapTypeChanged);

   MainMap.OnMarkerClick += new MarkerClick(MainMap_OnMarkerClick);
   MainMap.OnMarkerEnter += new MarkerEnter(MainMap_OnMarkerEnter);
   MainMap.OnMarkerLeave += new MarkerLeave(MainMap_OnMarkerLeave);

   MainMap.OnPolygonEnter += new PolygonEnter(MainMap_OnPolygonEnter);
   MainMap.OnPolygonLeave += new PolygonLeave(MainMap_OnPolygonLeave);

   MainMap.OnRouteEnter += new RouteEnter(MainMap_OnRouteEnter);
   MainMap.OnRouteLeave += new RouteLeave(MainMap_OnRouteLeave);

   MainMap.Manager.OnTileCacheComplete += new TileCacheComplete(OnTileCacheComplete);
   MainMap.Manager.OnTileCacheStart += new TileCacheStart(OnTileCacheStart);
   MainMap.Manager.OnTileCacheProgress += new TileCacheProgress(OnTileCacheProgress);

As you can see, the control options are quite simple. And there is nothing more to add.

Points of Interest

Well, it was quite cryptic to figure out how Google manages tiles, what coordinate system it uses, the JSON decryption, etc.


Go to the project's CodePlex site to get a running update of any changes or improvements I've made.  


This article, along with any associated source code and files, is licensed under The MIT License


About the Author
Software Developer
Lithuania Lithuania
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Comments and Discussions

GeneralMy vote of 5 Pin
Gun Gun Febrianza13-Oct-12 16:28
memberGun Gun Febrianza13-Oct-12 16:28 
GeneralRe: My vote of 5 Pin
Laurie Ayres23-Nov-12 14:10
memberLaurie Ayres23-Nov-12 14:10 
QuestionMain Map Pin
Qismet24-May-12 4:56
memberQismet24-May-12 4:56 
AnswerRe: Main Map Pin
radioman.lt24-May-12 6:31
memberradioman.lt24-May-12 6:31 
Qismet16-May-12 1:16
memberQismet16-May-12 1:16 
radioman.lt16-May-12 1:20
memberradioman.lt16-May-12 1:20 
GeneralRe: SOURCE CODE Pin
Qismet16-May-12 1:35
memberQismet16-May-12 1:35 
QuestionI need to use address instead of lat and lng? Pin
Ben Paxton14-Mar-12 3:06
memberBen Paxton14-Mar-12 3:06 
Need to use the address itself instead of latitude and lng
AnswerRe: I need to use address instead of lat and lng? Pin
radioman.lt14-Mar-12 4:10
memberradioman.lt14-Mar-12 4:10 
GeneralRe: I need to use address instead of lat and lng? Pin
Ben Paxton14-Mar-12 5:34
memberBen Paxton14-Mar-12 5:34 
GeneralRe: I need to use address instead of lat and lng? Pin
radioman.lt14-Mar-12 6:22
memberradioman.lt14-Mar-12 6:22 
AnswerRe: I need to use address instead of lat and lng? Pin
Dan Randolph27-Apr-17 13:16
professionalDan Randolph27-Apr-17 13:16 
QuestionSome simple documentation for GMap.Net Pin
smartradio13-Mar-12 3:20
membersmartradio13-Mar-12 3:20 
QuestionExample don´t working in C# 2008 Pin
smartradio13-Mar-12 3:18
membersmartradio13-Mar-12 3:18 
AnswerRe: Example don´t working in C# 2008 Pin
radioman.lt13-Mar-12 3:30
memberradioman.lt13-Mar-12 3:30 
GeneralRe: Example don´t working in C# 2008 Pin
smartradio13-Mar-12 5:16
membersmartradio13-Mar-12 5:16 
Questionoffline maps Pin
mojimoj29-Feb-12 1:25
membermojimoj29-Feb-12 1:25 
AnswerRe: offline maps Pin
radioman.lt29-Feb-12 2:44
memberradioman.lt29-Feb-12 2:44 
Questionnice app Pin
CIDev14-Feb-12 12:22
memberCIDev14-Feb-12 12:22 
AnswerRe: nice app Pin
radioman.lt14-Feb-12 23:11
memberradioman.lt14-Feb-12 23:11 
QuestionPb in using GMap contril in C++.NET Pin
gilmegviv31-Jan-12 12:11
membergilmegviv31-Jan-12 12:11 
AnswerRe: Pb in using GMap contril in C++.NET Pin
radioman.lt31-Jan-12 21:53
memberradioman.lt31-Jan-12 21:53 
GeneralRe: Pb in using GMap contril in C++.NET Pin
gilmegviv2-Feb-12 10:11
membergilmegviv2-Feb-12 10:11 
QuestionHow do I load a TMS that was created using maptiler and Geotiff Pin
Andrew Mellon20-Dec-11 13:58
memberAndrew Mellon20-Dec-11 13:58 
AnswerRe: How do I load a TMS that was created using maptiler and Geotiff Pin
radioman.lt20-Dec-11 21:34
memberradioman.lt20-Dec-11 21:34 

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