public interface IExecutable { void Execute(); } public class PrintMessageCommand : IExecutable { private string _message; public PrintMessageCommand(string message) { _message = message; } public void Execute() { Console.WriteLine(_message); } } // Usage var printHelloWorld = new PrintMessageCommand("Hello, world!"); printHelloWorld.Execute();In this example, we define an IExecutable interface and a PrintMessageCommand class that implements it. PrintMessageCommand takes a message as a constructor argument and prints it to the console when executed. The package/library that this code belongs to is not specified in the sample code provided.