I'm so glad I found the GeoDLL! It allowed me to implement the necessary coordinate transformations into our surveying software.

Who develops programs with geodetic functionality like world-wide coordinate transformations or distance calculations, can use geodetic functions of KilletSoft's GeoDLL. I use this Dynamic Link Library without any Problems with my favorite programming languages C++, C# and Java. KilletSoft provides ​appropriate templates for this programming languages. Most I use are some different coordinate transformations with geodetic datum transitions and NTv2 grid file transitions. Also some distance calculation ale done in my programs. I must say that GeoDLL is easy to use and it works without any problems.
Manni, July 2015