Hello Kevin ,

Here is a smple code how to remove items form ultradataSource. Fireing the event RowDeleted and
and removing the item form external data will be sinchronized in this way:
Me.externalData.Rows.RemoveAt(e.Row.Index)

Private Sub button1_Click(sender As Object, e As EventArgs)
    Dim rowItemsToRemove As New List(Of UltraDataRow)()
        For Each item As UltraDataRow In ultraDataSource1.Rows
        Dim value As Object = Me.ultraDataSource1.Rows(item.Index).GetCellValue(2)
        Dim intValue As Integer

        If TypeOf value Is System.DBNull OrElse (Int32.TryParse(TryCast(value, String), intValue) AndAlso intValue = 0) Then
            rowItemsToRemove.Add(item)
        End If
    Next

    For Each rowItem As UltraDataRow In rowItemsToRemove
        ultraDataSource1.Rows.Remove(rowItem, True)
    Next
End Sub


I hope this helps.

Best regards,
Dimi
Developer Support Engineer
Infragistics Inc

Hello Kevin,

I reproduce your problem , I get the same behavior when I go over the UltraDataSource rows and delete some of them, if I rise the Delete Row Event and delete the same row form the external data using this row: Me.externalData.Rows.RemoveAt(e.Row.Index)

The reson for that is very simple. You receve the same index, that’s alredy removed from the UltraDataSource and try to remove it from the external Data, that’s’ fine. First time when the event is fired, this is fine for both collections. But for the second you receive the index and try to remove it from the same location form the externalData  collection, but there is already removed record, so this index is incorrect, that’s way you are able to remove only even records.

One way to avoid this behavior when you are going to trough a collection an remove items from it, and update other related collection. You need to collect the removed records and remove them at once if you are using code for doing that, and without fired the event for delete.

I hope this helps.

Best regards,
Dimi
Developer Support Engineer
Infragistics Inc.