public void Execute()
{
Console.WriteLine("\t\tExtensionMethod");
OldClass oldClass = new OldClass();
oldClass.Test1();
oldClass.Test2();
oldClass.Test3();
oldClass.Test4(55);
oldClass.Test5();
var exMethod = "The most common extension methods are the LINQ standard query operators that add query functionality to the existing";
Console.WriteLine($"{exMethod}\nword count: {exMethod.GetWordcount()}");
}
public static void Test4(this OldClass o, int x) => Console.WriteLine($"Method4 {x}");
public static void Test5(this OldClass o) => Console.WriteLine($"Method5");
public static void Test3(this OldClass o) => Console.WriteLine($"Method3 {o.x}");
