Strange socket problem using FTP stream

[intraman]

I am successfuly connecting to an FTP server and have no problems with uploading / downloading files and initiating general file transfers. However, when attempting to list the directory I get a strange exception and it seemed to just start happening of its own accord.

Cannot access a disposed object.
Object name: 'System.Net.Sockets.NetworkStream'.

This is confusing! I am certainly not manually disposing any of the connection of stream reader objects, nor am I disposing anything else in this entire sub routine. On setting breakpoints, it seems that the array list is filled correctly but then the error fires when the status code is 226 despite me clearly specifying that the while loop should not run under these circumstances. (226 is equal to FtpStatusCode.ClosingData)

Any help would be really appreciated. I am stumped.

http://pastebin.com/dXN96ZuA