C# .Net Variables

Variables are defined bits of memory where temporary data is stored. C# is a strongly typed language, so there are different types of basic variables that can be declared depending on what typed of data you want stored in memory.

See below for C#.net basic built-in variable types, along with amount of memory used.

Type Description including: Min to Max Values Memory Usage
byte 0 to 255 8 bits (1 byte)
sbyte -128 to 127
short -32,768 to 32,767 16 bits (2 bytes)
ushort 0 to 65,535
int -2,147,483,648 to 2,147,483,647 32 bits (4 bytes)
uint 0 to 4,294,967,295
long -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 64 bits (8 bytes)
ulong 0 to 18,446,744,073,709,551,615
float -3.402823e38 to 3.402823e38 32 bits (4 bytes)
double -1.79769313486232e308 to 1.79769313486232e308 64 bits (8 bytes)
decimal -79228162514264337593543950335 to 79228162514264337593543950335 128 bits (16 bytes)
char A Unicode character. 16 bits (2 bytes)
string A string of Unicode characters. Dependent on length of string
bool True or False. 8 bits (1 byte)
object An object. Dependent on object
struct Used to group related types. Dependent on variables in struct
enum A distinct type that consists of a set of named constants called the enumerator list. Dependent on length of list
BigInteger Arbitrary precision integer. Supports values far beyond Int64, from virtually negative/positive infinity (limited only by system memory) Dynamic (depends on value size)

The below type isn't really a specific type, hence the reason why I separated it from the specific types listed above:

Type Description
var var is an implicit type which can alias any type, with no performance issues. It helps to make programs shorter and easier for us to read

Variables can also be instantiated class to become an object. You can also use the 'var' type for these, or the class name as the type.