Application.Current Property

Application is a per-AppDomain singleton type that implements the static Current property to provide shared access to the Application instance for the current AppDomain. This design guarantees that state managed by Application, including shared resources and state, is available from a single, shared location.

This property is thread safe and is available from any thread.

.NET Framework

.NET Framework Client Profile

Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Reference