CLR Data Types and more

Built-in Types Table

C# Type	.NET Framework type
bool	System.Boolean
byte	System.Byte
sbyte	System.SByte
char	System.Char
decimal	System.Decimal
double	System.Double
float	System.Single
int	System.Int32
uint	System.UInt32
long	System.Int64
ulong	System.UInt64
object	System.Object
short	System.Int16
ushort	System.UInt16
string	System.String

Source: http://msdn.microsoft.com/en-us/library/aa287910(VS.71).aspx

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Range and Size

Type	Range	Size
bool	true or false (1 or 0)	1 bit
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 32,767	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
Type	Approximate range	Precision
float	±1.5 × 10−45 to ±3.4 × 1038	7 digits
double	±5.0 × 10−324 to ±1.7 × 10308	15-16 digits

Source: http://msdn.microsoft.com/en-us/library/exx3b86w(VS.71).aspx and http://msdn.microsoft.com/en-us/library/9ahet949(VS.71).aspx

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Default values

Value type	Default value
bool	false
byte	0
char	'\0'
decimal	0.0M
double	0.0D
enum	The value produced by the expression (E)0, where E is the enum identifier.
float	0.0F
int	0
long	0L
sbyte	0
short	0
struct	The value produced by setting all value-type fields to their default values and all reference-type fields to null.
uint	0
ulong	0
ushort	0

Source: http://msdn.microsoft.com/en-us/library/83fhsxwc(VS.71).aspx

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Implicit Numeric Conversions Table

From	To
sbyte	short, int, long, float, double, or decimal
byte	short, ushort, int, uint, long, ulong, float, double, or decimal
short	int, long, float, double, or decimal
ushort	int, uint, long, ulong, float, double, or decimal
int	long, float, double, or decimal
uint	long, ulong, float, double, or decimal
long	float, double, or decimal
char	ushort, int, uint, long, ulong, float, double, or decimal
float	double
ulong	float, double, or decimal

Source: http://msdn.microsoft.com/en-us/library/y5b434w4(VS.71).aspx

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Explicit Numeric Conversions Table

From	To
sbyte	byte, ushort, uint, ulong, or char
byte	sbyte or char
short	sbyte, byte, ushort, uint, ulong, or char
ushort	sbyte, byte, short, or char
int	sbyte, byte, short, ushort, uint, ulong, or char
uint	sbyte, byte, short, ushort, int, or char
long	sbyte, byte, short, ushort, int, uint, ulong, or char
ulong	sbyte, byte, short, ushort, int, uint, long, or char
char	sbyte, byte, or short
float	sbyte, byte, short, ushort, int, uint, long, ulong, char, or decimal
double	sbyte, byte, short, ushort, int, uint, long, ulong, char, float, or decimal
decimal	sbyte, byte, short, ushort, int, uint, long, ulong, char, float, or double

Source: http://msdn.microsoft.com/en-us/library/aa288039(VS.71).aspx