The CSpeak class enables an application to perform text synthesis operations.
To add the Text-to-Speech feature to your TAPI application, all you need to do is call the TAPICall.CSpeak.Speak method.
For a list of all members of this type, see CSpeak Members.
Namespace: TAPIEx
Assembly: TAPIEx.Net.Dll
CSpeak is compatible with Microsoft SAPI 4.0 or SAPI 5.1. [SAPI (Speech API) is the Microsoft standard class for Speech Recognition (SR) and Text-to-Speech (TTS) engines. ]
You also need to have a TTS (Text-to-Speech) engine installed on your computer. A number of these engines are available from different vendors. Microsoft, for example, offers a freely redistributable TTS engine at Microsoft web site.