C# is a strongly typed language; therefore every variable and object must have a declared type.

A data type can be described as being either:

A built-in data type, such as an int or char, or

A user-defined data type, such as a class or interface.

Data types can also be defined as being either:

Value Types (C# Reference), which store values, or

Reference Types (C# Reference), which store references to the actual data.

Class is a user define data type.

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