How to use an other sound for speech in c#.net ?

You have a selection of installed voices to choose from: use System.Speech.Synthesis.SpeechSynthesizer.GetInstalledVoices, see http://msdn.microsoft.com/en-us/library/system.speech.synthesis.speechsynthesizer.aspx[^], http://msdn.microsoft.com/en-us/library/system.speech.synthesis.speechsynthesizer.getinstalledvoices.aspx[^].

A voice selection can be made by the method SelectVoice; pass a name parameter using the property VoiceInfo.Name, see http://msdn.microsoft.com/en-us/library/system.speech.synthesis.speechsynthesizer.selectvoice.aspx[^], http://msdn.microsoft.com/en-us/library/system.speech.synthesis.voiceinfo.name.aspx[^].

See also a good overview article http://msdn.microsoft.com/en-us/magazine/cc163663.aspx[^].

You can add a new voice to the system and use it for synthesis. You can purchase and download additional voices on sites like:
http://www.nextup.com/TextAloud/SpeechEngine/voices.html[^],
http://www.acapela-group.com/download-infovox-desktop-text-to-speech-demo.html[^].

From what I know — it can be expensive.

—SA