Occurs on the client side when the Changes Preview window is shown.
The BatchEditChangesPreviewShown event handler receives an argument of the ASPxClientEventArgs type.
The ASPxGridView control allows you to modify a batch of grid data on the client side and send it to the server in a single request. All user changes are maintained on the client side until the Save changes button is clicked, or all changes are canceled by clicking the Cancel changes button. The Preview changes button allows switching the grid to Preview Changes mode and manage modified rows.
The BatchEditChangesPreviewShown event occurs when an end-user has clicked the Preview changes command button and the grid has already switched to Preview changes mode.