Something

private static void SmarterBubbleSort(int[] arr, out int swaps, out int compares)
        {
            swaps = 0;
            compares = 0;

            bool swapped = true;

            int end = arr.Length - 1;
            int start = 0;

            //int first = 0;
            //int last = end;

            bool forwards = true;

            while (swapped)
            {
                swapped = false;

                if (forwards)
                {
                    for (int i = start; i < end; i++)
                    {
                        compares++;
                        if (arr[i + 1] < arr[i])
                        {
                            swaps++;
                            if (!swapped)
                            {
                                swapped = true;
                                //first = (i == 0) ? 0 : (i - 1);
                            }
                            Swap(ref arr[i + 1], ref arr[i]);
                        }
                    }
                    end--;
                }
                else
                {
                    for (int i = end - 1; i >= start; i--)
                    {
                        compares++;
                        if (arr[i + 1] < arr[i])
                        {
                            swaps++;
                            if (!swapped)
                            {
                                swapped = true;
                                //last = i;
                            }
                            Swap(ref arr[i + 1], ref arr[i]);
                        }
                    }
                    start++;
                }

                PostUpdate(arr);

                forwards = !forwards;
            }
        }