private static void Main(string[] args)
{
var stringBuilder = new StringBuilder();
var addShortWord = new AddWordCommand(stringBuilder, "short | ");
var addLongWord = new AddWordCommand(stringBuilder, "veryLongCamelCaseWord | ");
var commandProvider = new CommandProvider<AddWordCommand>();
commandProvider.PerformCommand(addShortWord);
commandProvider.PerformCommand(addLongWord);
Console.WriteLine("Builder now is " + stringBuilder);
commandProvider.PerformCommand(addShortWord);
commandProvider.PerformCommand(addLongWord);
commandProvider.PerformCommand(addLongWord);
Console.WriteLine("Builder now is " + stringBuilder);
commandProvider.UndoCommand();
commandProvider.UndoCommand();
Console.WriteLine("Builder now is " + stringBuilder);
Console.ReadKey();
}