c# - How to check if slideshow is running -

i want check if slideshow running. here code:

private void checkslideshow() {     if (globals.thisaddin.application.activepresentation.slideshowwindow.active == msotrue)     {     //slideshow running     } } 

i error: the name 'msotrue' not exist in current context

what msotrue , need write here ... == ?

write msotristate.msotrue http://msdn.microsoft.com/en-us/library/ms251168.