How to Prevent Deletion Of Record From ListView

In This Controller That Record is Deleted Whose BillNo is Null Write a Controller and Inherit : DeleteObjectsViewController protected override void Delete(SimpleActionExecuteEventArgs args) { if (View.ObjectTypeInfo.Type == typeof(DispatchRegister)) { List list = new List(); foreach (DispatchRegister item in args.SelectedObjects) { if (item.BillNo==null || item.BillNo.Length<=0) { list.Add(item); } } if (list.Count == 0) { XtraMessageBox.Show("Record Can Not be Deleted. You Can Delete Only those Record whose Bill No is Blank"); } else { BaseDelete(list); } return; } base.Delete(args); } private void BaseDelete(System.Collections.IList argsSelectedObjects) { ObjectSpace.Delete(argsSelectedObjects); if (AutoCommit || View.IsRoot) { ObjectSpace.CommitChanges(); } if (View is ListView) { ((ListView)View).Editor.Refresh(); } else { View.Close(); } }