Question

maybe its silly but I am not sure if there is difference between types and data types

int is data type

class A{}

A is type or data type?

Answer 1

There is no such thing as a “data type” in any .NET language. “Data type” is often used to clarify “type” to refer to the actual runtime type of the variable rather than a more abstract notion of what “kind” of value is present.

int is what’s referred to as a value type. All primitive types (int, double, char, etc.) are value types, with the exception of string, which is a reference type (though, like value types, it’s immutable).

Any object declared as a class is a reference type. Any object declared as a struct is a value type.