If an overload exists that takes an IFormatProvider argument, it should always be called in favor of an overload that does ...

If an overload exists that takes an IFormatProvider argument, it should always be called in favor of an overload that does not. Some methods in the runtime convert a value to or from a string representation and take a string parameter that contains one or more characters, called format specifiers, which indicate how the value is to be converted. If the meaning of the format specifier varies by culture, a formatting object supplies the actual characters used in the string representation. In scenarios where sorting and comparison behavior should never change between cultures, specify CultureInfo.InvariantCulture, otherwise, specify CultureInfo.CurrentCulture.