Change Item in a LinkedList

[FranciscoDias]

I have a list and I want to change one item for another

        public void ActualizarProduto(Produto obj)
        {
            foreach (Produto tmp in ListProdutos)
            {
                if (obj.Text == tmp.Text)
                {
                    tmp = obj;
                    return;
                }
            }
        }

it seems I can't use tmp = obj because it is a foreach;
(btw: it will only find one result - there is only on item with same text)

If you have any ideia, it would be very helpful thank you in advance