title: Adding new line using StringBuilder
body: <p>I want to send user an email as below:<br>
  Here is the Verification Code<br>
  UserName: xyz<br>
  Code: xyz  </p>
  
  <p>Here is my all code about email:</p>
  
  <pre><code>StringBuilder emailMessage = new StringBuilder();
  emailMessage.Append("Here is the Verification Code.");
  emailMessage.Append(Environment.NewLine);
  emailMessage.Append("UserName: " + UsernameTextBox.Text).AppendLine();
  emailMessage.AppendLine();
  emailMessage.Append("Code:  " + newCode);
  MailMessage email = new MailMessage();
  email.To.Add(new MailAddress(emailAddress));
  email.Subject = "Subject";
  email.Body = emailMessage.ToString();
  email.IsBodyHtml = true;
    //Send Email; 
  SmtpClient client = new SmtpClient();
  client.Send(email);  
  </code></pre>
  
  <p>This code sends mail with a single line i.e. Here is the verification code. UserName: xyz Code: xyx<br>
  I tried using <code>emailMessage.Append(Environment.NewLine);</code> I also tried <code>"\n"</code>, <code>\r\n</code> but nothing worked. what's wrong with it or where am I missing something? </p>