public class Bus { // Static variable used by all Bus instances. // Represents the time the first bus of the day starts its route. protected static readonly DateTime globalStartTime; // Property for the number of each bus. protected int RouteNumber { get; set; } // Static constructor to initialize the static variable. // It is invoked before the first instance constructor is run. static Bus() { globalStartTime = DateTime.Now; // The following statement produces the first line of output, // and the line occurs only once. Console.WriteLine("Static constructor sets global start time to {0}", globalStartTime.ToLongTimeString()); } // Instance constructor. public Bus(int routeNum) { RouteNumber = routeNum; Console.WriteLine("Bus #{0} is created.", RouteNumber); } // Instance method. public void Drive() { TimeSpan elapsedTime = DateTime.Now - globalStartTime; // For demonstration purposes we treat milliseconds as minutes to simulate // actual bus times. Do not do this in your actual bus schedule program! Console.WriteLine("{0} is starting its route {1:N2} mn after global start time {2}.", this.RouteNumber, elapsedTime.Milliseconds, globalStartTime.ToShortTimeString()); } } class TestBus { static void Main() { // The creation of this instance activates the static constructor. Bus bus1 = new Bus(71); // Create a second bus. Bus bus2 = new Bus(72); // Send bus1 on its way. bus1.Drive(); // Wait for bus2 to warm up. System.Threading.Thread.Sleep(25); // Send bus2 on its way. bus2.Drive(); // Keep the console window open in debug mode. System.Console.WriteLine("Press any key to exit."); System.Console.ReadKey(); } } /* Sample output: Static constructor sets global start time to 3:57:08 PM. Bus #71 is created. Bus #72 is created. 71 is starting its route 6.00 minutes after global start time 3:57 PM. 72 is starting its route 31.00 minutes after global start time 3:57 PM. */