Line break via script in the new UI 4.6

Hello everybody, I’m trying to add line break in a string, and then assign it to a text of a label. The problem is that the label does not show the line break. What am I doing wrong?

`
string cost = CurrentBuilding.Building.CostDescription;

cost.Replace(“,”, "
");

LabelBuildingCost.text = cost;
`

cost.Replace(“,”, "
"); <= this return the new string.
use this:

    cost = cost.Replace(",", "

“); //”
" new line