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Getting Started   ASP.NET Base Types

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This document illustrates the relationship between the .NET Framework base data types and the primitive data types used by programming languages that target the common language runtime.

The System namespace is the root namespace for fundamental types in the .NET Framework. This namespace includes classes that represent the base types used by all applications.

Each of the .NET Framework base data types, also known as value types, correspond to the primitive data types used by the supported programming languages. When writing code using .NET Framework types, you can use the equivalent keyword of the language when a .NET Framework data type is expected.

The following table lists the value types the .NET Framework supplies, briefly describes each type, and indicates the corresponding type in Visual Basic, C#, the Managed Extensions for C++, and JScript.

Category	Class Name	Description	Visual Basic	C#	C++	JScript
Integer	Byte	An 8-bit unsigned integer.	Byte	byte	char	byte
	SByte	An 8-bit signed integer. Not CLS compliant.	SByte	sbyte	signed char	SByte
	Int16	A 16-bit signed integer.	Short	short	short	short
	Int32	A 32-bit signed integer.	Integer	int	int or long	int
	Int64	A 64-bit signed integer.	Long	long	__int64	long
	UInt16	A 16-bit unsigned integer. Not CLS compliant.	UInt16	ushort	unsigned short	UInt16
	UInt32	A 32-bit unsigned integer. Not CLS compliant.	UInt32	uint	unsigned int or unsigned long	UInt32
	UInt64	A 64-bit unsigned integer. Not CLS compliant.	UInt64	ulong	unsigned __int64	UInt64
Floating point	Single	A single-precision ( 32-bit ) floating-point number.	Single	float	float	float
	Double	A double-precision ( 64-bit ) floating-point number.	Double	double	double	double
Logical	Boolean	A Boolean value ( true or false ).	Boolean	bool	bool	bool
Other	Char	A Unicode ( 16-bit ) character.	Char	char	wchar_t	char
	Decimal	A 96-bit decimal value.	Decimal	decimal	Decimal	Decimal
	IntPtr	A signed integer whose size depends on the underlying platform ( a 32-bit value on a 32-bit platform and a 64-bit value on a 64-bit platform ).	IntPtr	IntPtr	IntPtr	IntPtr
	UIntPtr	An unsigned integer whose size depends on the underlying platform ( a 32- bit value on a 32-bit platform and a 64-bit value on a 64-bit platform ). Not CLS compliant.	UIntPtr	UIntPtr	UIntPtr	UIntPtr
Class objects	Object	The root of the object hierarchy.	Object	object	Object*	Object
	String	An immutable, fixed-length string of Unicode characters.	String	string	String*	String

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