A string containing the percent symbol.
Type Reason ArgumentNullException The value specified for a set operation is a null reference. InvalidOperationException The current instance is read-only and a set operation was attempted.
The string assigned to the NumberFormatInfo.PercentSymbol property is included in the result string when a numeric value is formatted with the "P" standard numeric format specifier or with a format string that includes the "%" custom numeric format specifier.