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How to Deal with Empty RadMap using BingRestMapProvider


Product Version Product Author
2022.3.1109 RadMap for WinForms Desislava Yordanova


When using RadMap with the BingRestMapProvider, the map may remain empty. This article shows how to handle this unexpected behavior and load the map tiles.


BingRestMapProvider internally loads tile data from the Bing Maps REST service which requires TLS 1.2 coming automatically with .NET Framework 4.7. It is necessary to ensure the version explicitly by setting the System.Net.ServicePointManager.SecurityProtocol property to SecurityProtocolType.Tls12. More information is available here: Transport Layer Security (TLS) best practices with the .NET Framework.

 // How to specify Tls 1.2 for .NET Framework 4.0
 //System.Net.ServicePointManager.SecurityProtocol =(System.Net.SecurityProtocolType)3072;

 System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Tls12;

 string cacheFolder = @"..\..\cache";

 BingRestMapProvider bingProvider = new Telerik.WinControls.UI.BingRestMapProvider();
 bingProvider.UseSession = true;
 bingProvider.BingKey = bingKey;

 LocalFileCacheProvider cache = new LocalFileCacheProvider(cacheFolder);
 bingProvider.CacheProvider = cache;


'How to specify Tls 1.2 for .NET Framework 4.0
'System.Net.ServicePointManager.SecurityProtocol = CType(3072, System.Net.SecurityProtocolType)

System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Tls12

Dim cacheFolder As String = "..\..\cache"

Dim bingProvider As BingRestMapProvider = New Telerik.WinControls.UI.BingRestMapProvider()
bingProvider.UseSession = True
bingProvider.BingKey = bingKey

Dim cache As New LocalFileCacheProvider(cacheFolder)
bingProvider.CacheProvider = cache


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