Speech recognition in C#

I'm doing a project that involves speech recognition. But here i don't just need to recognize simple commands, I need my application to identify a lengthy sentence. Such as "My name is jack, I live in UK". I'm currently us开发者_开发知识库ing Microsoft SAPI5.1. But when i execute my application it doesn't take what I'm saying accurately.

Can any one give me a better option of getting this done. I need to capture what I'm saying and convert it to a Text. Please help

The best option for speech recognition would have to be Nuance's Dragon Naturally Speaking. Note that it is a commercial solution though.