Instead of calling this:

private void CommitChanges(DataSet ds)
{    
	foreach (DataTable dt in ds.Tables)    
	{        
		foreach (DataRow dr in ds.Tables)        
		{            
			dr.EndEdit();        
		}    
	}
}

why not do this when I create the table:

dt.ColumnChanged += new DataColumnChangeEventHandler(dt_ColumnChanged);

then in the event do this:

void dt_ColumnChanged(object sender, DataColumnChangeEventArgs e){    e.Row.EndEdit();}

This would fire each time the user changes a bound item on a form, wouldn't it? If so, them I'm assured that the table's rowstate
would always show modifed for changed items.