Extract data from signed but modified exe (data appended after end of digital certificate section) C#

I justed learned that it is possible to append data to a signed exe file. I found some questions here which are related to this topic.

In this blog post you can learn how to append data to an exe file without invalidating the digital signature: http://ift.tt/1sd3peD

My question is - after modifying the exe and appending data to it, how can I successfully retrieve it again when running the executable?

I have a signed executable, written in C#. I append information to it after the end of the digital certificate section, which does not break the digital signature. I can execute this exe without problems. But how can I then retrieve the information I appended again?

I need to retrieve the information from within the program while it is running.

Any help and hints will be appreciated!

Best regards and thanks!