Enable file editing in Visual Studio's debug mode

Visual Studio 使用及调试必知必会
http://www.cnblogs.com/luminji/p/3287728.html

How do I enable file editing in Visual Studio's debug mode?

http://stackoverflow.com/questions/1105292/how-do-i-enable-file-editing-in-visual-studios-debug-mode

1. Web application -> Properties
    Web Tab : Check "Enable Edit and Continue"
2. Tools -> Options
    Debuggion -> Edit and Continue : Uncheck "Enable Edit and Continue"