String is collections of sequence character but the .NET technology it is a class representing a read-only text containing Unicode characters and these Unicode character are used to manipulate its contents. The String class is used for related operations such as concatenation, search, comparison, sorting, formatting, copying and displaying text and also used in globalized and localized applications by providing options for applying culture sensitive conventions for string operations wherever applicable. String in the .NET Framework considers Null as a character in the string form which results in the string operations executed in the .NET environment but not in the same way as execution in native C/++ code.