A bit about SOLID in C#

gistfile1.txt

1) A must watch: 
Bob Martin SOLID Principles of Object Oriented and Agile Design
https://www.youtube.com/watch?v=TMuno5RZNeE

2) Then...
Applying S.O.L.I.D. Principles in .NET/C#
https://www.youtube.com/watch?v=gwIS9cZlrhk

3) And then a bit of articles: 
https://johnlnelson.com/2014/07/20/solid-design-principles/ 
and 5 related articled: 
https://johnlnelson.com/2014/07/20/single-responsibility-principle-in-c-solid-design-principles/
https://johnlnelson.com/2014/07/20/open-closed-principle-in-c-solid-design-principles/
https://johnlnelson.com/2014/07/20/liskov-substitution-principle-in-c-solid-design-principles/
https://johnlnelson.com/2014/07/20/interface-segregation-principle-in-c-solid-design-principles/
https://johnlnelson.com/2014/07/23/dependency-inversion-principle-in-c-solid-design-principles/

And the rest can be found on Google...