The dialog language does not affect spelling. To change the language used for spelling, use theC1SpellChecker.MainDictionary property to select a different spelling dictionary. By default, the built-in spell dialog C1SpellDialog is displayed in the language specified by the current culture. If the current culture specifies a language that is not available, then the dialog will be displayed in English. See the DialogLanguage enumeration for a list of supported dialog languages.