private void SpreadsheetDataOnSelectionChanged(SpreadsheetPanel sender)
        {
            int col, row;

            sender.GetSelection(out col, out row);
            CellSelectionChange?.Invoke(col, row);
        }
        public void TestMethod1()
        {
            Controller controller = new Controller(this);

            CellSelectionChange.Invoke(0, 1);

            Assert.AreEqual(controller.SelectedCell.CellColumn, 0);
            Assert.AreEqual(controller.SelectedCell.CellRow, 1);
            Assert.AreEqual(controller.SelectedCell.CellName, "A2");
        }