DataGrid Null Items
deletes a text box column entry or
changes a check box to false
in the grid,
the grid errors with can not convert system.dbnull to string and
the update errors with must have a value for the check box.
It appears that the grid is setting empty strings to null and unchecked check boxes to null.
How can I prevent this?
I really would like to do the buisness rule checking and error handling in the buisness object.
That is not a bunch of exception handling and guessing in the grids error event.

