Arrays in C#

Write a function kthLargest(arr, k), that takes an integer array and integer k, 
 that returns the k-th largest element in the array.
Examples:
array=[5,-3,9,1]
*k=0=>return:9
*k=1=>return:5
*k=3=>return:-3

public int kthLargest(int[] arr, int k)
{
  Array.Reverse(arr);
  return = arr[k];
}

 public ActionResult Arrays(int[] inArr, int k)
  //find the highest value in the array
  //  ret = arr.Max();
  for (int i = 0; i < arr.Length; i++)
  {
	if ( inArr[i] > ret) 
    {
	  ret = inArr[i];
	}
  }

  return View();
}