ArgumentOutOfRangeException when cancelling editing in XtraGrid editform

Hi,

I have bound a List(Of entity) (same result with a Mindscape.LightSpeed.EntityCollection(Of entity)) to a DevExpress XtraGrid though a BindingSource (same result with direct binding).

I am editing a row in the grid using the built-in EditForm. When I accept the changes, everything works as expected. When I cancel the edit, I get the following error:

Der Index muss sich innerhalb der Listenbegrenzung befinden.
Parametername: index

   bei System.ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument argument, ExceptionResource resource)
   bei System.Collections.Generic.List`1.Insert(Int32 index, T item)
   bei System.ComponentModel.BindingList`1.InsertItem(Int32 index, T item)
   bei Mindscape.LightSpeed.EntityCollection`1.CancelEdit()
   bei Mindscape.LightSpeed.Entity.CancelEdit()
   bei Mindscape.LightSpeed.Entity.CancelEdit()
   bei Mindscape.LightSpeed.EntityCollection`1.CancelEdit()
   bei Mindscape.LightSpeed.Entity.CancelEdit()
   bei Mindscape.LightSpeed.EntityCollection`1.CancelEdit()
   bei Mindscape.LightSpeed.Entity.CancelEdit()
   bei Mindscape.LightSpeed.Entity.CancelEdit()
   bei Mindscape.LightSpeed.EntityCollection`1.CancelEdit()
   bei Mindscape.LightSpeed.Entity.CancelEdit()
   bei Mindscape.LightSpeed.Entity.CancelEdit()
   bei Mindscape.LightSpeed.EntityCollection`1.CancelEdit()
   bei Mindscape.LightSpeed.Entity.CancelEdit()
   bei Mindscape.LightSpeed.Entity.CancelEdit()
   bei Mindscape.LightSpeed.EntityCollection`1.CancelEdit()
   bei Mindscape.LightSpeed.Entity.CancelEdit()
   bei Mindscape.LightSpeed.Entity.CancelEdit()
   bei Mindscape.LightSpeed.EntityCollection`1.CancelEdit()
   bei Mindscape.LightSpeed.Entity.CancelEdit()
   bei Mindscape.LightSpeed.Entity.CancelEdit()
   bei Mindscape.LightSpeed.Entity.CancelEdit()
   bei System.Windows.Forms.CurrencyManager.CancelCurrentEdit()
   bei DevExpress.Data.CurrencyDataController.CancelCurrentRowEdit()
   bei DevExpress.XtraGrid.Views.Base.ColumnView.CancelUpdateCurrentRow()
   bei DevExpress.XtraGrid.EditForm.Helpers.EditFormController.CancelValues()
   bei System.Windows.Forms.Control.OnClick(EventArgs e)
   bei DevExpress.XtraEditors.BaseButton.OnMouseUp(MouseEventArgs e)
   bei System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   bei System.Windows.Forms.Control.WndProc(Message& m)
   bei DevExpress.Utils.Controls.ControlBase.WndProc(Message& m)
   bei DevExpress.XtraEditors.BaseControl.WndProc(Message& msg)
   bei System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

Can you please help me resolving this?

Thanks, Marc

Sorry the error is a bit vague, it appears when we are trying to undo the operations the item is being inserted incorrectly back into the list but its not clear why or what the value of index is which would be useful to know. If you can provide us with a small repro project for this we can try and debug it further.

Jeremy