C# - Median

public static double getMedian(double[] array)
        {
            int zaehlen = array.GetLength(0);
                if (zaehlen == 0) return (0);
            Array.Sort(array);
            if ((zaehlen % 2) == 0)
                return ((array[(int)(zaehlen / 2) - 1] + array[(int)(zaehlen / 2)]) / 2);
            else
                return (array[zaehlen / 2]);
        }