Return the data item by column and row index. This accessor does not support column names, iteration or unique value lookup, but it is very fast.
The column index (1 ... ColCount)
The row index (1 ... RowCount)
Do not display an error message if the row or column index are out of range, just return Null.
Debug.Print lst.ItemByIndex(2, 4) lst.ItemByIndex(2, 4) = "DataTest1"