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.NET Framework Essentials, 3rd Edition by Hoang Lam, Thuan L. Thai

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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. ...

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