C# Write a send email component

using System;
using ;
using ;
using ;
 
namespace 
{
  public class MailEntity
  {
    public string from;
    public string to;
    public string fromName;
    public string toName;
    public string cc;
    public bool isHtml;
    public string subject;
    public string body;
    public string attach;
  }
}

using System;
using ;
using ;
using ;
using ;
using ;
 
namespace 
{
  public class MailServer
  {
    MailEntity _entity = null;
    MailSetting _settings = null;
    public MailServer(MailEntity entity, MailSetting settings)
    {
      this._entity = entity;
      this._settings = settings;
    }
    public bool Send()
    {
      try
      {
        MailMessage message = new MailMessage(_settings.smtpUser, _entity.to);
         = _entity.isHtml;
         = _entity.subject;
         = _entity.body;
        if (!(_entity.cc))
        {
          (_entity.cc);
        }
        if (!(_entity.attach))
        {
          Attachment atta=new Attachment(_entity.attach);
          (atta);
        }
 
        SmtpClient client = new SmtpClient(_settings.smtpHost, _settings.smtpPort);
         = new NetworkCredential(_settings.smtpUser, _settings.smtpPass);
 
        (message, null);
 
        return true;
      }
      catch (Exception)
      {
      }
      return false;
    }
  }
}

using System;
using ;
using ;
using ;
 
namespace 
{
  public class MailSetting
  {
    public string smtpHost = "";
    public int smtpPort;
    public string smtpUser = "";
    public string smtpPass = "";
    public MailSetting()
    {
    }
    public MailSetting(string smtpServer, int smtpPort, string smtpUser, string smtpPass)
    {
       = smtpServer;
       = smtpPort;
       = smtpUser;
       = smtpPass;
    }
  }
}