public int[] SelectionSort(int[] arr)  {      //1. Find min      //2. Swap it with first element      //3. Repeat starting from secong position onwards.      int _min = 0;      for (int i = 0; i < arr.Length; i++)      {          _min = i;          for (int j = i; j < arr.Length; j++)          {              if (arr[j] < arr[_min])                  _min = j;          }          int _temp = arr[i];          arr[i] = arr[_min];          arr[_min] = _temp;      }      return arr;  }