Data Type In c#

Data Types

Data Types define the type of data that a variable can store. Some variables store numbers, others store names. The built-in VB.NET type aliases and their equivalent .NET Framework types follow:

Integers

VB Alias	.NET Type	Size	Range
SByte	System.SByte	8 bits (1 byte)	-128 to 127
Byte	System.Byte	8 bits (1 byte)	0 to 255
Short	System.Int16	16 bits (2 bytes)	-32,768 to 32,767
UShort	System.UInt16	16 bits (2 bytes)	0 to 65,535
Integer	System.Int32	32 bits (4 bytes)	-2,147,483,648 to 2,147,483,647
UInteger	System.UInt32	32 bits (4 bytes)	0 to 4,294,967,295
Long	System.Int64	64 bits (8 bytes)	-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
ULong	System.UInt64	64 bits (8 bytes)	0 to 18,446,744,073,709,551,615

Floating-point

VB Alias	.NET Type	Size	Precision	Range
Single	System.Single	32 bits (4 bytes)	7 digits	1.5 x 10-45 to 3.4 x 1038
Double	System.Double	64 bits (8 bytes)	15-16 digits	5.0 x 10-324 to 1.7 x 10308
Decimal	System.Decimal	128 bits (16 bytes)	28-29 decimal places	1.0 x 10-28 to 7.9 x 1028

Other pre-defined types

VB Alias	.NET Type	Size (bits)	Range
Char	System.Char	16 bits (2 bytes)	One Unicode symbol in the range of 0 to 65,535.
Boolean	System.Boolean	32 bits (4 bytes)	True or False
Object	System.Object	32/64 bits (4/8 bytes)	Platform dependent (a reference to an object).
Date	System.DateTime	64 bits (8 bytes)	January 1, 0001 12:00:00 AM to December 31, 9999 11:59:59 PM
String	System.String	80 + [16 * Length] bits (10 + [2 * Length] bytes)	A Unicode string with a maximum length of 2,147,483,647 characters.

 

Value Types

·         All numeric data types

·         Boolean, Char, and Date

·         All structures, even if their members are reference types

·         Enumerations, since their underlying type is always SByte, Short, Integer, Long, Byte, UShort, UInteger, orULong

Reference Types

·         String

·         All arrays, even if their elements are value types

·         Class types, such as Form

·         Delegates

Elements That Are Not Types

·         Namespaces

·         Modules

·         Events

·         Properties and procedures

·         Variables, constants, and fields