In the C# programming language, an object can be either a value type or a reference type. While a variable of a value type contains its value, a variable of a reference type contains a reference to an object, or a reference to an instance of the type.
The key distinction between a value type and a reference type is in the assignment semantics. Additionally, because a value type is always “copied by value,” when you pass a value type as a parameter to a method or assign it to a variable, the entire data is copied. By contrast, when you assign a reference type, only the reference is copied; both references point to the same object in the memory.
C# also lets us create what’s called value objects, a special type of object used in domain-driven design that allows us to articulate domain concepts simply, clearly, and concisely. In this article we will examine value objects, discuss their benefits, and illustrate how we can use them in C#.
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