Represents a String that is either a variable-length stream of characters or Null.
For a list of all members of this type, see NullableString Members.
A NullableString type can sound very strange because System.String is a Reference-Type and it can already be null (Nothing in Visual Basic). Anyway a NullableString parameter (or field or property) explicity states that a Null value is welcome: you wont get an ArgumentNullException passing Null to a NullableString method parameter (or field or property). Moreover NullableString permits to treat Null values for a String like for any other type of NullableTypes.
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