Please find the below links which could give you useful information to get the major/minor version Or retrieving version information of any assembly dll.

http://www.java2s.com/Code/CSharp/Development-Class/Demonstratesretrievingversioninformation.htm

http://www.geekpedia.com/KB11_How-do-I-retrieve-the-Major-and-Minor-application-(assembly)-version-and-the-Build-and-Revision-number.html

Thanks, Sri

Srinivasa Rao Pentapati