Write a program to find the minimum number of steps to sort

public static int get_order(int[] input1)
{
	var sortedArray = input1.OrderByDescending(o => o).ToArray();
	var unsortedArray = input1;
	int temp1;
	int swap = 0;

	int arrayLength = sortedArray.Length;
	for (int i = 0; i < arrayLength; i++)
	{
		if (sortedArray[i] != unsortedArray[i])
		{
			temp1 = unsortedArray[i];
			unsortedArray[i] = sortedArray[i];
			for (int j = i + 1; j < arrayLength; j++)
			{
				if (unsortedArray[j] == sortedArray[i])
				{
					unsortedArray[j] = temp1;
					swap++;
					break;
				}
			} 
		}
	}

	return swap;
}

static void Main(string[] args)
        {
           int[] number = { 3,1,2};

           int result =  get_order(number);

            Console.ReadKey();
        }