The System.Globalization namespace contains classes that define culture-related information, including the language, the country/region, the calendars in use, the format patterns for dates, currency, and numbers, and the sort order for strings. These classes are useful for writing globalized (internationalized) applications. Classes like StringInfo and TextInfo provide advanced globalization functionalities, such as surrogate support and text element processing.

 Classes

	Class	Description
	Calendar	Represents time in divisions, such as weeks, months, and years.
	CharUnicodeInfo	Retrieves information about a Unicode character. This class cannot be inherited.
	ChineseLunisolarCalendar	Represents time in divisions, such as months, days, and years. Years are calculated using the Chinese calendar, while days and months are calculated using the lunisolar calendar.
	CompareInfo	Implements a set of methods for culture-sensitive string comparisons.
	CultureAndRegionInfoBuilder	Defines a custom culture that is new or based on an existing culture and region. The custom culture can be installed on a computer and subsequently used by any application running on that computer. This class cannot be inherited.
	CultureInfo	Provides information about a specific culture, such as the names of the culture, the writing system, the calendar used, and how to format dates and sort strings.
	DateTimeFormatInfo	Defines how DateTime values are formatted and displayed, depending on the culture.
	DaylightTime	Defines the period of daylight-saving time.
	EastAsianLunisolarCalendar	Represents a calendar that divides time into months, days, years, and eras, and whose dates are based on cycles of the sun and the moon.
	GregorianCalendar	Represents the Gregorian calendar.
	HebrewCalendar	Represents the Hebrew calendar.
	HijriCalendar	Represents the Hijri calendar.
	IdnMapping	Supports the use of non-ASCII characters for Internet domain names. This class cannot be inherited.
	JapaneseCalendar	Represents the Japanese calendar.
	JapaneseLunisolarCalendar	Represents time in divisions, such as months, days, and years. Years are calculated the same way as the Japanese calendar, while days and months are calculated using the lunisolar calendar.
	JulianCalendar	Represents the Julian calendar.
	KoreanCalendar	Represents the Korean calendar.
	KoreanLunisolarCalendar	Represents time in divisions, such as months, days, and years. Years are calculated using the Gregorian calendar, while days and months are calculated using the lunisolar calendar.
	NumberFormatInfo	Defines how numeric values are formatted and displayed, depending on the culture.
	PersianCalendar	Represents the Persian calendar.
	RegionInfo	Contains information about the country/region.
	SortKey	Represents the result of mapping a string to its sort key.
	StringInfo	Provides functionality to split a string into text elements and to iterate through those text elements.
	TaiwanCalendar	Represents the Taiwan calendar.
	TaiwanLunisolarCalendar	Represents the Taiwan lunisolar calendar. Years are calculated using the Gregorian calendar, as does the Taiwan calendar, while days and months are calculated using the lunisolar calendar.
	TextElementEnumerator	Enumerates the text elements of a string.
	TextInfo	Defines properties and behaviors, such as casing, that are specific to a writing system.
	ThaiBuddhistCalendar	Represents the Thai Buddhist calendar.
	UmAlQuraCalendar	Represents the Saudi Hijri (Umm-Al Qurah) calendar.

 Enumerations

	Enumeration	Description
	CalendarAlgorithmType	Specifies whether a calendar is solar-based, lunar-based, or lunisolar-based.
	CalendarWeekRule	Defines different rules for determining the first week of the year.
	CompareOptions	Defines the string comparison options to use with CompareInfo.
	CultureAndRegionModifiers	Specifies constants that define a CultureAndRegionInfoBuilder object.
	CultureTypes	Defines the types of culture lists that can be retrieved using CultureInfo.GetCultures.
	DateTimeStyles	Defines the formatting options that customize how the DateTime.Parse and DateTime.ParseExact methods parse a string.
	DigitShapes	Specifies the culture-specific display of digits.
	GregorianCalendarTypes	Defines the different language versions of the Gregorian calendar.
	NumberStyles	Determines the styles permitted in numeric string arguments that are passed to the Parse methods of the numeric base type classes.
	UnicodeCategory	Defines the Unicode category of a character.