static void StrategyPattern()
{
Console.WriteLine("\n\nStrategy Pattern");
var context = new StrategyPattern.Context(new Type1StrategyA(), new Type1StrategyB());
context.Apply();
context.SetStrategyA(new Type2StrategyA());
context.Apply();
context.Execute();
context.SetStrategyB(new Type2StrategyB());
context.Execute();
}