There is no sound when MessageBox pops up after updating code to the new 7.1

It's by Design.

From MSFT Peter Torr:

"Are you saying that when the MessageBox appears, there is no longer a sound played? If so, that's by design. The MessageBox sound was annoying in most cases and was unable to be turned off (so even if you had an app in "silent" mode, it would still play noise when the MessageBox was shown). If you really want a sound to play when the MessageBox is shown, you could use an XNA SoundEffect for that purpose. "

http://forums.create.msdn.com/forums/t/86684.aspx

 

 

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