here http://www.codeproject.com/KB/database/CsvReader.aspx
they are offering both source and binary files. if i am a programmer who needs to use the files, why should they be providing me with both? why not just give me the source and i will compile it?
Some people don't have the compiler, but want to run the software.
In case the user wants to see the application run before digging into the source.
It is convention on CodeProject to provide a working solution and source code as separate packages. Users of the site come to expect it.