Chude_Xem

Table 1-1: Built-in Value Types
Type (Visual Basic/C# alias)	Bytes	Range	Use for
System.SByte (SByte/sbyte)	1	-128 to 127	Signed byte values
System.Byte (Byte/byte)	1	0 to 255	Unsigned bytes
System.Int16 (Short/short)	2	-32768 to 32767	Interoperation and other specialized uses
System.Int32 (Integer/int)	4	-2147483648 to 2147483647	Whole numbers and counters
System.UInt32 (UInteger/uint)	4	0 to 4294967295	Positive whole numbers and counters
System.Int64 (Long/long)	8	-9223372036854775808 to 9223372036854775807	Large whole numbers
System.Single (Single/float)	4	-3.402823E+38 to 3.402823E+38	Floating point numbers
System.Double (Double/double)	8	-1.79769313486232E+308 to 1.79769313486232E+308	Precise or large floating point numbers
System.Decimal (Decimal/decimal)	16	-79228162514264337593543950335 to 79228162514264337593543950335	Financial and scientific calculations requiring great precision

Table 1-2: Other Value Types
Type (Visual Basic/C# alias)	Bytes	Range	Use for
System.Char (Char/char)	2	N/A	Single Unicode characters
System.Boolean (Boolean/bool)	4	N/A	True/False values
System.IntPtr (none)	Platform-dependent	N/A	Pointer to a memory address
System.DateTime (Date/date)	8	1/1/0001 12:00:00 AM to 12/31/9999 11:59:59 PM	Moments in time

Table 1-3: Common Reference Types
Type	Use for
System.Object	The Object type is the most general type in the Framework. You can convert any type to System.Object, and you can rely on any type having ToString, GetType, and Equals members inherited from this type.
System.String	Text data.
System.Text.StringBuilder	Dynamic text data.
System.Array	Arrays of data. This is the base class for all arrays. Array declarations use language-specific array syntax.
System.IO.Stream	Buffer for file, device, and network I/O. This is an abstract base class; task-specific classes are derived from Stream.
System.Exception	Handling system and application-defined exceptions. Task-specific exceptions inherit from this type.

Table 1-5: Common Stream Types
System.IO Type	Use to
FileStream	Create a base stream used to write to or read from a file
MemoryStream	Create a base stream used to write to or read from memory
StreamReader	Read data from the stream
StreamWriter	Write data to the stream