Regional settings affect almost all aspects of C1Input functionality. Formatting, parsing, validating data and performing masked input all depend on cultural settings for string comparison, numeric and date time formats and special characters, such as decimal point character. See description of the CultureInfo class in .NET Framework documentation for details on culture-specific settings.

C1Input controls use the CultureInfo property gets or sets the current CultureInfo object. It contains all the settings, the CultureInfo object corresponding to the specified culture ID. Users can also customize culture from the CultureInfo property. Another setting affecting most of C1Input functionality is the Boolean CaseSensitive property (although it is not culture-related). Case sensitivity is used in string comparisons. C1Input controls have a CaseSensitive property that defines the default case sensitivity for all operations. You can override this setting in most classes controlling particular functionality, such as ParseInfo, PreValidation, PostValidation, and so on.