Explores object-oriented programming concepts and C# .NET syntax and features, with a focus on iterative development and testing. This course uses a variety of resources including Unified Modeling Language (UML) diagrams to present design principles and concepts. Learners will create console and GUI C# .NET applications which incorporate n-tier design principles and object-oriented design principles and patterns, emphasizing the use of composition over inheritance, interfaces and polymorphism. Additional topics include: class libraries, exception handling, event handlers and basic user interface design and validation.