DataTypes in C#.Net

Equivalent Data types chart of CTS, C#.net and VB.net

Category	Class name (CTS Data type)	Visual Basic data type	C# data type
Integer	Byte	Byte	Byte
	SByte	SByte	sbyte
	Int16	Short	short
	Int32	integer	int
	Int64	Long	Long
	UInt16	UShort	ushort
	UInt32	UInteger	uint
	UInt64	ULong	ulong
Floating point	Single	Single	float
	Double	Double	double
Logical	Boolean	Boolean	bool
Other	Char	Char	char
	Decimal	Decimal	decimal
	Intptr	IntPtr No built-in-type	IntPtr No built-in-type
	UIntptr	UIntPtr No built-in-type	UIntPtr No built-in-type
Class object	Object	Object	object
	String	String	string

Table for Data types their Memory Sizes and Ranges

Type	Range	Size
sbyte	-128 to 127	Signed 8-bit integer
byte	0 to 255	Unsigned 8-bit integer
char	U+0000 to U+ ffff	Unicode 16-bit character
short	-32,768 to 32767	Signed 16-bit integer
ushort	0 to 65,535	Unsigned 16-bit integer
int	-2,147,483,648 to 2,147,483,647	Signed 32-bit integer
uint	0 to 4,294,967,295	Unsigned 32-bit integer
long	-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807	Signed 64-bit integer
ulong	0 to 18,446,744,073,709,551,615	Unsigned 64-bit integer
Floating point	1.5*10-45 to 3.4 *1038, 7-digit precision	Signed 32-bit integer
double	5.0*10-324 to 1.7*10308, 15-digit precision	Signed 32-bit integer
decimal	1.0*10-28 to 7.9 *1028, 28-digit precision	Signed 128-bit integer

 

Key words in C#.NET

Keywords are predefined reserved identifiers that have special meaning to the compiler

Keyword cannot be used as variables in your program unless they include @ as a prefix

C#.Net supports 2 types of keywords 1) Reserved keywords 2) Contextual keywords

There are 77 Reserved keywords and 6 Contextual keywords present in C#.Net

Reserved keywords

abstract                     event                   new                  struct

as                              explicit                null                  switch

base                          extern                  object               this

bool                          false                     operator           throw

break                        finally                  out                    true

byte                          fixed                     override           try

case                          float                      params             typeof

catch                         for                        private              uint

char                           foreach                protected           ulong

checked                     goto                     public                unchecked

class                          if                          readonly             unsafe

const                         implicit                ref                       ushort

continue                    in                         return                  using

decimal                     int                        sbyte                   virtual

default                      interface               sealed                  volatile

delegate                    internal                 short                    void

do                             is                         sizeof                  while

double                      lock                      stacklloc

else                           long                      static

enum                        namespace            string

Contextual keywords

get               partial                 set

value           where                 yield

• A Contextual keyword is used to provide a specific meaning in the code, but it is not a reserved word in C#
• get Defines an accessor method for a property or an indexer
• partial Defines partial classes, structs, and interfaces throughout the same compilation unit
• set Defines an accessor method for a property or an indexer
• where Adds constraints to a generic declaration
• yield Used in an iterator block to return a value to the enumerator object or to signal the end of iteration
• value Used to set accessors and to add or remove event handlers.