ขึ้นบรรทัดใหม่ใน Edit Box (newline in edit box)

In case of using multiline option,
You can not use simple "n" anymore.
Use this one instead

[src]
m_ShowOutput+="HellornWorld";
[/src]

The result would be
[src]
Hello
World
[/src]

Note: r mean "return"