错误处理："Could not load file or assembly 'Oracle.DataAccess' or one of its dependencies. An attempt was made to load a program with an incorrect format."

情况：部署程序在 IIS 7.5 windows server 2008 R2 64 bit OS，引用“Oracle.DataAccess.dll” 

运行程序会出现："Could not load file or assembly 'Oracle.DataAccess' or one of its dependencies. An attempt was made to load a program with an incorrect format."

解决方式：设置IIS  app pool 允许 32bit.如下图：