Visual Studio: My build actions are missing

Since this seems to be a faq without an answer: In Visual Studio 2008 (and earlier?) if your project files are missing their Advanced properties - like Build Action - it probably means you were handed a "web application" that is actually a "web site" in Visual Studio parlance. You have to create a new "web application", copy over the source files, and a few other steps to complete the conversion. Some relevant links:

VS 2005: Converting a Web Site Project to a Web Application Project in Visual Studio 2005

VS 2008: Converting VS 2008 Website to Web Application

VS 2010: Converting a Web Site Project to a Web Application Project