How to bind new line in multiline textbox asp.net c#?

I have multiple text box.the values sample is given below.i bind the long descrption in multiple line text box.i bind the value from different tables.

Bind using

(tbxlongdesc.text = tbxlongdesc.text +dtobjScopeTable.Rows[k][1].ToString())

now if any line more than 120 characters i split into another line.how to do it

PROVIDING SERVICES WITHOUT MATERIAL

HIRING
MANPOWER
CATEGORY : UNSKILED
CATEGORY TYPE : HELPER

Job Scope

Himesh

Vendor Obligation

BOARDING AND LODGING,PERSONAL PROTECTIVE EQUIPMENT (PPE),TRAVEL - DELHI TO VENDOR LOCATION,TRAVEL - INTERNAL,TRAVEL - VENDOR TO HMEL LOCATION,TRAVEL - TO AND FRO

DELHI Obligation

CONSUMABLES,TOOLS AND TACKLES