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String Class in Dot Net

Definition: - String is a data type that Represents text; that is, a series of Unicode characters.

Thread Safety: - This type is safe for multithreaded operations.
A string is a sequential collection of Unicode characters, typically used to represent text, while a String is a sequential collection of System.Char objects that represents a string. The value of the String is the content of the sequential collection, and the value is immutable.

A String is called immutable because its value cannot be modified once it has been created. Methods that appear to modify a String actually return a new String containing the modification. If it is necessary to modify the actual contents of a string-like object, use the System.Text.StringBuilder class.

A single Char usually represents a single code point; that is, the numeric value of the Char equals the code point. However, a code point might require more than one encoded element.

An index is the position of a Char, not a Unicode character, in a String. An index is a zero-based, nonnegative number starting from the first position in the string, which is index position zero. Consecutive index values might not correspond to consecutive Unicode characters because a Unicode character might be encoded as more than one Char. 


Members of String perform either an ordinal or linguistic operation on a String. An ordinal operation acts on the numeric value of each Char object. A linguistic operation acts on the value of the String taking into account culture-specific casing, sorting, formatting, and parsing rules. Linguistic operations execute in the context of an explicitly declared culture or the implicit current culture.

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