how to extract common file path from list of file paths in c#

Question

What is the best way extract the common file path from the list of file path strings in c#?

Eg: I have a list 5 file paths in List variable, like below

c:\

Answer 1

You could break the paths down into segments (i.e. split by the backslash), then build back a segment at a time and compare the results until you find the end of the match. I doubt that is the best way, but it would work.