Unique value on the export in C#

Hi all

I'm wanting to export a value to the CS which I want to be unique.

I've read a few pages regarding how this can be done using custom worksflows etc, but I'm wanting to do the comparison this based on what's in the CS rather than FIM/MV, as there's more objects (unrelated to FIM) in there that may already have this generated value.

I originally found the MV class utils.findmventries:

https://msdn.microsoft.com/en-us/library/windows/desktop/ms698827%28v=vs.85%29.aspx

I'm wondering if there's something just like this but for the CS or is there a better way?