Answered by : uptight-unicorn-697i8q5ycg9h

using (StreamWriter writer = new StreamWriter("email.txt", true)) //// true to append data to the file
{ writer.WriteLine("your_data");
}

Source : https://stackoverflow.com/questions/12444826/write-data-from-textbox-into-text-file-in-asp-net-with-c-sharp | Last Update : Wed, 08 Jul 20