About DLL hack

Can we open .dll to find source codes ???
im just want to learn about dll hacks
please help me.. or give me some source hack codes that has been detected to learn please..

Learn C++ First

done.. i learn 1 week.. but when build always error.. please help me. the eror like this..

========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
1>------ Build started: Project: noreload, Configuration: Debug Win32 ------
1>Compiling...
1>main.cpp
1>c:\documents and settings\wisnu\desktop\zzz\noreload\noreload\main. cpp(61) : error C2017: illegal escape sequence
1>c:\documents and settings\wisnu\desktop\zzz\noreload\noreload\main. cpp(61) : error C2017: illegal escape sequence
1>c:\documents and settings\wisnu\desktop\zzz\noreload\noreload\main. cpp(61) : error C2059: syntax error : '=='
1>Build log was saved at "file://c:\Documents and Settings\wisnu\Desktop\zzz\noreload\noreload\Debug \BuildLog.htm"
1>noreload - 3 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

i just want to make a simple no reload.. please help