IVR and C#

I want to develop a low-cost IVR application with C# as the language. I want text-to-speech and speech-recognition

If you application is not that complicated, you could use Voicent IVR Studio to create your application. No programming required. If you want to extend the application, such as integrate it with a web site or database, you could use the IVR Studio web interface (using HTTP protocol), or Java interface.

If your application requires more complicated, and you have to use C#, then use Voicent Gateway. The gateway is a VoiceXML based development platform. For samples, tutorials, and documentation, please see Voicent developer network