private static Laptop CreateLaptop(string brand) { // Creating array of Color string[] color = "White Black Silver".Split(); // Creating array of Include string[] include = "WirelessMouse BluetoothEarPhone BluetoothSpeaker LaptopBag ACPowerAdaptor".Split(); // Creating array of pictures string[] handles = "apple asus acer hp lenovo dell".Split(); Laptop laps = new Laptop { Brand = brand, ModelNo = random.Next(1000, 9999), IsSsd = random.NextDouble() < 0.4, SerialNo = random.Next(10000000, 99999999), Color = color[random.Next(color.Length)], Include = new List <Includes>(), Handle = "Images\\" + handles[random.Next(handles.Length)] + ".png" }; int numberOfInclude = random.Next(2, 4); for (int i = 0; i < numberOfInclude; i++) { } Includes.AddInclude(laps, random.Next(Includes.NUMBER_OF_INCLUDE), random.Next(2, 4)); return(laps); }