Maybe the fact that I mentioned WPF when the OP was looking for ASP.NET was the reason. I don't see how my answer was wrong in that context as you could esily substitute the WPF front end with a ASP.NET version (or have both, and....).
I don't speak Idiot - please talk slowly and clearly
If the topic isn't something you are interested in, or have knowledge of, then you will give up on it and that won't help you. Find something that interests you and use that as a basis of your project.
*pre-emptive celebratory nipple tassle jiggle* - Sean Ewington
First of all this is wrong place to ask this question. Such question could be asked in GIT or Lounge.
Secondly, I appreciate the intention that you have behind posting this question i.e. learning but perhaps(like others said) you should be able to come up with some ideas on your own.
thirdly, my suggestion would be to start small application like contact book/address book or small forums. but keep in mind that your sole focus should be on learning various concepts related to C# and ASP.NET than just getting your project done.
Every now and then say, "What the Elephant." "What the Elephant" gives you freedom. Freedom brings opportunity. Opportunity makes your future.