Answer:
This is again a great c# interview question , but .NET professionals tend to answer this question in one liners like i am a developer , project manager.
My main role in the project was coding , unit testing and bug fixing. Said and done that i was involved in all phases of the project. I worked with the business analyst in the requirement phase to gather requirements and wasa active member in writing use cases. I also assisted the technical architect in design phase. In design phase i helped the architect in proof of concept and putting down the technical design document. My main role was in coding phase where i executed project with proper unit testing. In system integration test and UAT i was actively involved in bug fixing.
Incase you are doing some extra activities in the company like helping COE , presales team or any other initiative do speak about the same.