What are the data types, value types and reference types in C#?

Datatype are of two types in C# i.e. Value type, reference type, and pointer type.

Value Types

Value type variables can be assigned a value directly. They are derived from the class System.ValueType.

The following are the Value type data types −

Type	Represents	Range	Default Value
	bool	Boolean value	True or False
byte	8-bit unsigned integer	0 to 255	0
char	16-bit Unicode character	U +0000 to U +fff	'\0'
decimal	128-bit precise decimal values with 28-29 significant digits	(-7.9 x 1028 to 7.9 x 1028) / 100to 28	0.0M
double	64-bit double-precision floating point type	(+/-)5.0 x 10-324 to (+/-)1.7 x 10308	0.0D
float	32-bit single-precision floating point type	-3.4 x 1038 to + 3.4 x 1038	0.0F
int	32-bit signed integer type	-2,147,483,648 to 2,147,483,647	0
long	64-bit signed integer type	-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807	0L
sbyte	8-bit signed integer type	-128 to 127	0
short	16-bit signed integer type	-32,768 to 32,767	0
uint	32-bit unsigned integer type	0 to 4,294,967,295	0
ulong	64-bit unsigned integer type	0 to 18,446,744,073,709,551,615	0
ushort	16-bit unsigned integer type	0 to 65,535	0

Reference Types

The reference types do not contain the actual data stored in a variable, but they contain a reference to the variables.

The following are the Reference Types in C# −

Object Type − The Object Type is the ultimate base class for all data types in C# Common Type System (CTS).

Dynamic Type − Store any type of value in the dynamic data type variable. Type checking for these types of variables takes place at run-time.

String Type − The String Type allows you to assign any string values to a variable. The string type is an alias for the System.String class