I've implemented an undo capability into the grid. If a user changes the value of a field but they want to reverse the change they will click on the undo button and the change is undone. This undo functionality remembers only the last change. I've implemented this using List's and by clearing out the grid and re-building the grid using the data in the lists. It works but it's slow. Imagine re-building a 2000 row X 800 column grid. I tried saving the previous state of the data in the grid in another datatable and then getting rid of the current datatable and making this datatable the current one but I ran into many problems. Because rows and columns can be deleted the datatable rejectchanges() function is of no use.
Any ideals would be appreciated.