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.
