Gets a value that indicates whether the window is active.
Assembly: PresentationFramework (in PresentationFramework.dll)
An active window is the user's current foreground window and has the focus, which is signified by the active appearance of the title bar. An active window will also be the top-most of all top-level windows that don't explicitly set the Topmost property.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2