Microsoft Windows Vista introduced a new standard dialog box, called task dialog, to present choices in a clear and consistent way, with a standardized look and layout to replace the old message box which has often been used to create dialog boxes that are difficult to understand and use. There are no standard classes in .NET Framework to work with task dialogs and also there's no alternative what to do when an application is run on operating systems other than Windows Vista. The TaskDialog.NET component provides classes .NET developers can use to add Vista-style task dialogs to their .NET applications that will work on any platform supported by the .NET Framework. Developers simply use TaskDialog class in their code to construct task dialogs as needed and when showing the task dialog the TaskDialog.NET will either use native task dialog API if available (on Windows Vista) or use standard .NET classes to construct identical task dialog on other operating systems.
Version 1.2 adds NavigatePage support which allows the task dialog to dynamically change its contents at run time (used for creating wizard task dialogs).