Writing to next line

Question

Hi.
I am getting data with datareader and I want to show this data on every line. I try "\n,\n\n,\r\n" but I it didnt work. Its gettign only one row. How can i do that?

My codes are below,

while (rdr_gonderilecek.Read())
                    {
                        gonderilecek_data += rdr_gonderilecek["iletiler"].ToString()+"\n";
                    }