Occurs when the DataGridView.VirtualMode property of the System.Windows.Forms.DataGridView control is true and a cell value has changed and requires storage in the underlying data source.
Use this event in virtual mode to update a custom data store with user-specified data. Handle the DataGridView.CellValueNeeded event to retrieve values from the data store for display in the control.
For more information about virtual mode, see Virtual Mode in the Windows Forms DataGridView Control.
For more information about handling events, see Consuming Events.