Doubt with textbox

I'm trying to create a log screen using textbox in C# .

At certain points in the program, I'd like to insert a line in this textbox . Take the example:

Linha 1> Realizando inserção..
Linha 2> Dados inseridos..
Linha 3> Pedido Realizado.

I tried to do it like this:

txtBoxLog.Text = "Realizando inserção..\n";

But each line of this program, instead of inserting a new line in textbox , it deletes what is written and puts the new value.

Sincerely, Yves Fernandes