Build Binary Search Tree - C#

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public static BinaryTreeNode BuildBinarySearchTree(int[] sortedArray)
        {
            if (sortedArray.Length == 0)
                return null;

            int _mid = sortedArray.Length / 2;
            BinaryTreeNode _root = new BinaryTreeNode(sortedArray[_mid]);
            int[] _left = GetSubArray(sortedArray, 0, _mid - 1);
            int[] _right = GetSubArray(sortedArray, _mid + 1, sortedArray.Length - 1);
            _root.Left = BuildBinarySearchTree(_left);
            _root.Right = BuildBinarySearchTree(_right);

            return _root;
        }


        public int[] GetSubArray(int[] array, int start, int end)
        {
            List<int> _result = new List<int>();
            for (int i = start; i <= end; i++)
            {
                _result.Add(array[i]);
            }
            return _result.ToArray();
        }

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• Build Binary Search Tree - C#