.NET Framework Essentials, 3rd Edition

Appendix C. Common Data Types

Each of the .NET languages can provide its own keywords for the types it supports. For example, a keyword for an integer in VB is Integer, whereas in C# or C++ it is int; a boolean is Boolean in VB, but bool in C# or C++. In any case, the integer is mapped to the class Int32, and the boolean is mapped to the class Boolean in the System namespace. Table C-1 lists all simple data types common to the .NET Framework. Non-CLS-compliant types are not guaranteed to interoperate with all CLS-compliant languages.

Table C-1. Common data types

Type	Description
Boolean	True or false.
Byte	8-bit unsigned integer: 0 to 255.
Char	Character. Unicode 16-bit character.
DateTime	Represents a date and time value.
Decimal	Can represent positive and negative values with 28 significant digits: -79,228,162,514,264,337,593,543,950,335 to 79,228,162,514,264,337,593,543,950,335 .
Double	Stores 64-bit floating-point values: -1.79769313486231570e308 to 1.79769313486231570e308.
Guid	Represents a globally unique identifier (GUID); this is stored internally as a 128-bit integer. Commonly represented as a series of lowercase hexadecimal digits in groups of 8, 4, 4, 4, and 12 digits and separated by hyphens (e.g., 382c74c3-721d-4f34-80e5-57657b6cbc27).
Int16	Stores 16-bit signed integers: -32,768 to 32,767.
Int32	Stores 32-bit signed integers: -2,147,483,648 to 2,147,483,647.
Int64	Stores 64-bit signed integers: -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807. ...