DialogResult res =
  PSTaskDialog.cTaskDialog.ShowTaskDialogBox("The main instruction text for
                                             the TaskDialog goes here.",
                                            "The content text for the task
                                             dialog is shown here and the
                                             text will automatically wrap as
                                             needed.",
                                            "Any expanded content text for
                                             the task dialog is shown here
                                             and the text will automatically
                                             wrap as needed.",
                                            "Optional footer text with an
                                             icon can be included",
                                            "Don't show me this message 
                                             again",
                                            "Radio Option 1|Radio Option 2|
                                             Radio Option 3",
                                            "Command Button 1|
                                             Command Button 2\nLine 2\
                                             nLine 3|Command Button 3",
                                            PSTaskDialog.eTaskDialogButtons.
                                            OKCancel,
                                            PSTaskDialog.eSysIcons.
                                            Information,
                                            PSTaskDialog.eSysIcons.Warning);