Unlock the power of references, an essential aspect of object-oriented programming in C#.
Continue your C# learning journey with Learn C#: References. Learn about reference types like objects and interfaces, and how they differ from value types like `int` and `bool`. Dive into the `Object` and `String` reference types and see how valuable they are in programming.
* Upcast references
* Create null references
* Implement the `Object` type
### Notes on Prerequisites
We recommend that you complete [Learn C#: Classes, Objects, Interfaces, and Inheritance](https://www.codecademy.com/learn/learn-c-sharp-classes-objects-interfaces-and-inheritance) before completing this course.
Continue your C# learning journey with Learn C#: References. Learn about reference types like objects and interfaces, and how they differ from value types like `int` and `bool`. Dive into the `Object` and `String` reference types and see how valuable they are in programming.
* Upcast references
* Create null references
* Implement the `Object` type
### Notes on Prerequisites
We recommend that you complete [Learn C#: Classes, Objects, Interfaces, and Inheritance](https://www.codecademy.com/learn/learn-c-sharp-classes-objects-interfaces-and-inheritance) before completing this course.
