You briefly saw in Chapter 1 how to declare a new class called HelloWorld. In Chapters 2 and 3, you learned about the built-in primitive types included with C#. Since you have now also learned about control flow and how to declare methods, it is time to discuss defining your own types. Type definition is a core construct of any C# program; this support for classes and the objects created from them is what makes C# an object-oriented language.
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