the program returns a help message
added the Table interface, the ExcelLoader class and a new acceptance test for the ExcelLoader.Load() method
added the MemoryTable class and some tests
RowCount works correctly
tests for the ColCount property
added tests for the Columns property
successfully reading Excel files
added a new TableComparer class and some unit tests
more unit tests for the TableComparer class
added the MemoryTable.Dump method
refactoring - extracted the GetIndices method to a helper class
code complete