asp.net applications running without IIS

I have been using windows 开发者_C百科XP. I installed visual studio 2008 and sql server 2005. It has been removed suddenly due to some system corruption. I installed it again the visual studio 2008, IIS is not enabled in control panel too, but my applications is running.. whats going behind?Is it possible to run asp.net applications without enabling the IIS?

Will this cause any problems while developing the application?

Yes, Visual Studio comes Built in web server for development purposes, you may be using it.