CSharp - Data Types.

C# includes support for the following built-in data types:

Data Type	Range	Represents	Default Value
byte	0 .. 255	8-bit unsigned integer	0
sbyte	-128 .. 127	8-bit signed integer type	0
short	-32,768 .. 32,767	16-bit signed integer type	0
ushort	0 .. 65,535	16-bit unsigned integer type	0
int	-2,147,483,648 .. 2,147,483,647	32-bit signed integer type	0
uint	0 .. 4,294,967,295	32-bit unsigned integer type	0
long	-9,223,372,036,854,775,808 .. 9,223,372,036,854,775,807	64-bit signed integer type	0L
ulong	0 .. 18,446,744,073,709,551,615	64-bit unsigned integer type	0
float	-3.402823e38 .. 3.402823e38	32-bit single-precision floating point type	0.0F
double	-1.79769313486232e308 .. 1.79769313486232e308	64-bit double-precision floating point type	0.0D
decimal	-79228162514264337593543950335 .. 79228162514264337593543950335	128-bit precise decimal values with 28-29 significant digits	0.0M
char	A Unicode character.	16-bit Unicode character	'\0
string	A string of Unicode characters.	"
bool	True or False.	Boolean value	FALSE
object	An object.	"

Reference: microsoft