There are a lot of sites where you can get the sourcecodes and projects(both free and paid one) or the project ideas. Some of them are....
http://www.sourcecodesworld.com/ (simply the best one)..
http://www.project4students.net/
http://www.project4students.com
http://snippets.dzone.com
You can also get source codes for open projects, some of the good sites for those includes....
http://www.codeplex.com (Microsoft's open source project hosting web site)
http://www.codeproject.com
http://www.devarticles.com/c/b/ASP.NET