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private void OnDeleteItemCommand(BO.DC_RequisitionItem reqItem) { if (reqItem.id != 0) { var objReqItem = ViewData.Requisition.DC_RequisitionItemList.SingleOrDefault(m => m.id == reqItem.id); if (objReqItem != null) { //Get deleted item by item id var itemList = new ObservableCollection<BO.DC_RequisitionItem>(); foreach (var mx in ViewData.Requisition.DC_RequisitionItemList.Where(mx => mx.ReqRefNo == reqItem.id)) { itemList.Add(mx); } if (itemList.Any()) { foreach (var m in itemList) { ViewData.Requisition.DC_RequisitionItemList.Remove(m); var da = ViewData.Requisition.DC_RequisitionItemList.FirstOrDefault( mx =>m.ReqRefNo == objReqItem.id); if (da != null)