Foreach Loop Container Variable Mappings

There are two articles which did a nice job explaining this task

 

http://www.sqlis.com/post/Looping-over-files-with-the-Foreach-Loop.aspx

 

http://consultingblogs.emc.com/jamiethomson/archive/2005/05/30/SSIS_3A00_-Enumerating-files-in-a-Foreach-loop.aspx