IComparableT.txt

public abstract class Car : IComparable<Car> {
    public eManufacturer manufacturer { get; private set; }
    public int engine { get; private set; }
    public string licensePlate { get; private set; }
    public int NumOfKM { get; private set; }

    public void AddDistance(int DistanceInKM) {
        this.NumOfKM += Math.Abs(DistanceInKM);
    }

    public Car(string licensePlate, int engine, eManufacturer manufacturer) {
        this.licensePlate = licensePlate;
        this.engine = engine;
        this.manufacturer = manufacturer;
    }

    public int CompareTo(Car other) {
        return this.NumOfKM.CompareTo(other.NumOfKM);
    }
}

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// the using of IComparable 
var arr = this.cars_in_stock.ToArray();
Array.Sort(arr);
foreach (var a in arr)
    Console.WriteLine(string.Concat(a.licensePlate, " - ", a.NumOfKM, " KM"));