C# Online Compiler | .NET Fiddle

using System;
using System.Net;
using System.Net.Mail;
using System.Text;
					
public class Program
{
	public static void Main()
	{
		sendMail mail = new sendMail();
		mail.account = "xxx@gmail.com";
		mail.password = "xxx";
		mail.smtpServer = "smtp.gmail.com";
		mail.smtpPort = 587 ;
		mail.enableSSL = true;
		mail.code = Encoding.UTF8;
		mail.fromAddress = mail.account;
		mail.fromName = "測試名字";
		mail.toAddress = mail.account;
		mail.subject = "測試主旨";
		mail.content = "測試內容";
		
		try
		{
			mail.send();
			Console.WriteLine(mail.resultMessage);
		}
		catch(Exception)
		{
			Console.WriteLine("發生錯誤!!");
		}
	}
}

public class sendMail
{
	public string smtpServer { get; set; }
	public int smtpPort { get; set; }
	public string account { get; set; }
	public string password { get; set; }
	public bool enableSSL { get; set; }
	public string fromAddress { get; set; }
	public string fromName { get; set; }
	public Encoding code { get; set; }
	public string toAddress { get; set; }
	public string subject { get; set; }
	public string content { get; set; }
	public string resultMessage { get; set; }
	
	MailMessage message;
	public SmtpClient smtp;
	
	
	public bool send()
	{
		MailAddress from = new MailAddress(
			fromAddress, fromName, code);
		
		MailAddress to = new MailAddress(toAddress);
		message = new MailMessage(from, to);
		message.Subject = subject;
		message.SubjectEncoding = code;
		message.Body = content;
		message.BodyEncoding = code;
		
		smtp = new SmtpClient(smtpServer, smtpPort);
		smtp.Credentials = new NetworkCredential(account, password);
		smtp.EnableSsl = enableSSL;

		resultMessage = "信件送出中";
		smtp.Send(message);
		resultMessage = "信件已送出";
		smtp.Dispose();
		message.Dispose();
		
		return true;
	}
}

        smtp.Credentials = new NetworkCredential(account, password);
 
using System;
using System.Net;
using System.Net.Mail;
using System.Text;
                    
public class Program
{
    public static void Main()
    {
        sendMail mail = new sendMail();
        mail.account = "xxx@gmail.com";
        mail.password = "xxx";
        mail.smtpServer = "smtp.gmail.com";
        mail.smtpPort = 587 ;
        mail.enableSSL = true;
        mail.code = Encoding.UTF8;
        mail.fromAddress = mail.account;
        mail.fromName = "測試名字";
        mail.toAddress = mail.account;
        mail.subject = "測試主旨";
        mail.content = "測試內容";
        
        try
        {