public void Initialize()
        {
            _tree = new BPlusTree <int, string>(3);
            var keyValues = new Dictionary <int, string>
            {
                [50]  = "A",
                [10]  = "B",
                [100] = "C",
                [200] = "D",
                [20]  = "E",
                [300] = "F",
                [30]  = "G",
                [500] = "H",
                [250] = "I",
                [400] = "J",
                [270] = "K",
                [600] = "L",
                [150] = "M",
                [80]  = "N",
                [60]  = "O",
                [90]  = "P"
            };

            _tree.Build(keyValues);
        }