As per my experience, first, you have to be confident. And then you should skilfully do this when you introduce yourself by also mentioning your project. When you are asked to explain your project, prepare how to answer the following questions for sure.
- Explain the problem you solved.
- Explain what you created.
- Explain your role.
- Did you achieve what you set out to do?
- How can you make it better?
- Why did you choose this approach?
- What are the challenges you have faced?
- Explain about the toughest challenge you have faced and how did you resolve.
Also, watch this video on .Net Interview Questions to prepare for an interview: