Object-oriented Programming in C# Abstract classes, Interfaces, and Patterns
Sample use of IFormattable
The ToString method prescribed by IFormattable takes two parameters which allow finer control of
the string generation than the parameterless method ToString from class Object.
A reproduction of the interface IFormattable.
The ToString method of IFormattable:
The first parameter is typically a single letter formatting string,
and the other is an IFormatProvider
The IformatProvider can provide culture sensible information.
ToString from Object typically calls ToString(null, null)
The struct Card that implements IFormattable.
A client of Card which applies formatting of cards.
