To implement using C# , you must bridge the gap between abstract values (like those in the Agile Manifesto) and concrete technical execution. In a C# environment, this is primarily achieved through SOLID principles, Design Patterns , and Extreme Programming (XP) practices. 1. The Core Principles (SOLID)

Depend on abstractions, not concretions. Use Dependency Injection (DI) —built into .NET Core—to decouple your classes. 2. Essential Design Patterns in C#

Software entities should be open for extension but closed for modification. Use abstract classes and interfaces to allow new behavior without breaking existing code.