largest element in the array by comparing to All - C#

To find out the largest element in the array by comparing to All elements method
This methd has an Big Oh notation performance of O(n²)

 public static int GetIndexLargestCompareToAll(int[] numbers)
        {
            int currentMaxIndex = -1;
            int length = numbers.Length;
            bool isMax = false;

            try
            {
                if (length == 0)
                    currentMaxIndex = -1;
                else if (length == 1)
                    currentMaxIndex = 0;
                else
                {
                    for (int i = 0; i < length; i++)
                    {
                        isMax = true;
                        for (int j = 0; j < length; j++)
                        {
                            if (numbers[j] > numbers[i])
                                isMax = false;
                        }
                        if (isMax)
                            currentMaxIndex = i;
                    }
                }

            }
            catch (Exception)
            {
                currentMaxIndex = -1;
            }
            return currentMaxIndex;
        }