You may have noticed that there is no release build option for web apps.  That’s because all compilation settings are now stored in the <compilation> element of your configuration file under <system.web>.  Set debug attribute to false for release build.  For more information, check out the <compilation> help topic at ms-help://MS.VSCC.v80/MS.MSDN.v80/MS.NETDEVFX.v20.en/dv_ASPNETgenref/html/7c319582-074a-4d2a-a787-03b9d4541c12.htm