C # which are reference types and value types

Value types: integers, floating-point numbers, high-precision floating-point numbers, booleans, characters, structures, enumerations
Reference types: Objects (object), strings, classes, interfaces, delegates, arrays

In addition to value types and reference types, there is also a data type of empty type (NULL) GV

integers, floating-point numbers, high-precision floating-point numbers, booleans, characters, objects (object), string literals are predefined types
Structs, enumerations, classes, interfaces, delegates, arrays are composite types

C # which are reference types and value types