IApplicationService.StartService Method

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Called by an application in order to initialize the application extension service.

Namespace:  System.Windows
Assembly:  System.Windows (in System.Windows.dll)


Sub StartService ( _
    context As ApplicationServiceContext _
void StartService(
    ApplicationServiceContext context



You can implement this method in order to start your service and initialize any necessary resources.

This method is called for each registered application service before the Application.Startup event. If multiple services are registered, their StartService methods are called in the same order in which the services are registered.

The context parameter provides access to the application initialization parameters as specified in the host Web page.

For more information, see Application Extension Services.

Version Information


Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0


For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.