Many data models which may be helpful ...

http://www.databaseanswers.org/data_models/

Predicates in C#

myList = List<...>;

SomeObject desiredObject = myObjects.Find( o => o.Id == desiredId);

Just saw cytoscape .... looks very interesting

http://www.cytoscape.org/

Visio Pointer

http://www.c-sharpcorner.com/UploadFile/mgold/VisioInDotNet12032006222024PM/VisioInDotNet.aspx