Unable to cast object of type 'System.Data.DataRow' to type 'System.Data.DataRowView'.

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C#

C#4.0

I received the error:"Unable to cast object of type 'System.Data.DataRow' to type 'System.Data.DataRowView'. "

private void addToOrder(DataRowView drv)
        {
            DataRow dr = orderDataTable.NewRow();
            dr["ProductID"] = drv["ProductID"];
            dr["ProductBarcode"] = drv["ProductBarcode"];
            dr["ProductName"] = drv["ProductName"];
            dr["SalePrice"] = drv["SalePrice"];
            dr["SoldQuantity"] = 1;
            dr["NotEditable"] = false;
            try
            {
                orderDataTable.Rows.Add(dr);
            }
            catch (ConstraintException)
            {
                DataRow dr1 = orderDataTable.Rows.Find(drv["ProductID"]);
                dr1["SoldQuantity"] = Convert.ToInt32(dr1["SoldQuantity"]) + 1;
            }
        }
private void btnAddToOrder_Click(object sender, RoutedEventArgs e)
        {
            // add to order
            if(txtBarcodeAuto.Text.Length >0)
            {
                DataTable dscrntProd = prods.SelCrntProd4Sale(crntProdID);//get data from sql server database for product details(productID, ProductName,ProductPrice)
                foreach (DataRowView dr in dscrntProd.Rows)
                {
                    addToOrder(dr);
                }
            }
        }

Any help Most Appreciated
Thanks.