Add new lines to a Note<field>

I have an app that is a parts order form. I'm using a stateless form to input information. As the user selects and adds a part to their order I would like to have the items ordered appear in a note field.

The action of ordering a part happens when the user "clicks" on the [Form Action] Add [on click]
I've tried the below code, but nothing appears in the note field.

for each r in Temp_Parts_Order [Tech_ID == User.Employee_ID]
{
input.Pending_Order = input.Pending_Order + r.Description + " " + r.Part_Number.toString() + "<br>/>";

}