Selection Sort in C#

public static class SelectionSort {

public static void Sort(int[] arr) 
   {
    // Iterate over the entire array, except the last element (0...n-1).
    for(int i = 0; i < arr.Length - 1; i++) 
       {
        int min = i;
        // Iterate the remaining array (i...n)
        for(int j = i + 1; j < arr.Length; j++) 
           {
            // If j is less than the minimum, update the min index.
            if(arr[j] < arr[min]) 
               {
                min = j;
            }
        }
        // Do an in place swap.
        int tmp = arr[min];
        arr[min] = arr[i];
        arr[i] = tmp;
    }
}
}