C# Design principles illustrated in code made in Visual Studio with C# 7

SOLID Design Principles

Single Responsibility -used journal code example with persistance

Open Closed Principle -used a product search example with the specification pattern

Liskov Substitution -used the classic square vs rectangle example

Interface Segregation -used printer interface functionalties as an example

Dependency Inversion -created a geneology search that uses value tuples to determine a persons familial relationship