C# general email sending class sharing

using System;
using ;
using ;
using ;
using ;
using ;
using ;
using ;
using ;
using ;
using ;
using ;

namespace 
{
  /// <summary>
  /// Email  /// </summary>
  public class CheckEmailInfo
  {
    public string server { get; set; }//server    public string user { get; set; }//username    public string pwd { get; set; }//password  }

  /// <summary>
  /// SendEmail generic class, send emails through smtp server  /// </summary>
  public class SendEmail
  {
    public Dictionary<string, string> smtpServer;
    public Dictionary<string, string> popServer;

    public SendEmail()
    {     
      IniSmtpServer();
      IniPopServer();
    }

    /// <summary>
    /// Initialize the commonly used smtpServer to bind the drop-down selection menu    /// </summary>
    private void IniSmtpServer()
    {
      smtpServer = new Dictionary<string, string>();
      ("NetEase 163 Email", "smtp.");
      ("NetEase vip.163 Email", ".");
      ("NetEase 126 Email", "smtp.");
      ("NetEase 188 Email", "smtp.");
      ("Sina Email", "");
      ("Yahoo Mail", "");
      ("Sohu Email", "");
      ("TOM Email", "");
      ("Gmail Email", "");
      ("QQ Email", "");
      ("QQ Enterprise Email", "");
      ("139 Email", "smtp.");
      ("263 Email", "smtp.");      
    }

    /// <summary>
    /// Initialize the commonly used popServer, used to bind the drop-down selection menu    /// </summary>
    private void IniPopServer()
    {
      popServer = new Dictionary<string, string>();
      ("NetEase 163 Email", "pop3.");
      ("NetEase vip.163 Email", ".");
      ("NetEase 126 Email", "pop3.");
      ("NetEase 188 Email", "pop3.");
      ("Sina Email", "");
      ("Yahoo Mail", "");
      ("Sohu Email", "");
      ("TOM Email", "");
      ("Gmail Email", "");
      ("QQ Email", "");
      ("QQ Enterprise Email", "");
      ("139 Email", "pop.");
      ("263 Email", "pop.");
    }

    /// <summary>
    /// Send email function    /// </summary>
    /// <param name="fromEmail">Login email</param>    /// <param name="password">Login password</param>    /// <param name="user">Email nickname</param>    /// <param name="title">Email title</param>    /// <param name="toEmail">Email Address</param>    /// <param name="email">Email content</param>    /// <param name="smtpServer">smtp Server</param>    public bool SendMessage(string fromEmail,string password, string user, string title, string toEmail, string email,string smtpServer)
    {
      try
      {       
        SmtpClient smtp = new SmtpClient(); //Instantiate a SmtpClient         = ; //Set the outbound method of smtp to Network         = false;// Whether SSL encryption is enabled on the smtp server         = smtpServer;//Specify smtp server         = new NetworkCredential(fromEmail, password);
        MailMessage mm = new MailMessage(); //Instantiate an email class         = ; //The priority of emails is divided into Low, Normal, High, usually Normal is used         = new MailAddress(fromEmail, user, (936));
        (new MailAddress(toEmail, "", (936)));
         = title; //Email Title         = (936);
         = true; //Is the email body in HTML format = (936);         = email;
        (mm);
        return true;     
      }
      catch
      {
        return false;
      }
    }

    /// &lt;summary&gt;
    /// Check whether the email address is correct    /// &lt;/summary&gt;
    delegate bool MyDelegate(object checkEmailInfo);

    /// &lt;summary&gt;
    /// Use asynchronous method to check whether the email account and password are correct    /// &lt;/summary&gt;
    public bool CheckUser(string server, string user, string pwd)
    {      
      MyDelegate myDelegate = new MyDelegate(CheckUser);
      CheckEmailInfo checkEmailInfo = new CheckEmailInfo();
       = server;
       = user;
       = pwd;
      IAsyncResult result = (checkEmailInfo, null, null);
      (1000);//The main thread checks whether the asynchronous thread has been completed after 1 second      if ()
      { return (result); }//If the wrong mailbox and password are incorrect, the function will run very slowly      else
      { return false; }
    }
   

    /// &lt;summary&gt;
    /// Determine whether the user's email account and password are correct    /// &lt;/summary&gt;
    /// <param name="server">PopServer address</param>    /// <param name="user">username</param>    /// <param name="pwd">Password</param>    private bool CheckUser(object checkEmailInfo)
    {     
      CheckEmailInfo checkInfo = (CheckEmailInfo)checkEmailInfo;
      TcpClient sender = new TcpClient(, 110);//The pop protocol uses TCP's 110 port      Byte[] outbytes;
      NetworkStream ns;
      StreamReader sr;
      string input;
      string readuser = ;
      string readpwd = ;
      try
      {
        ns = ();
        sr = new StreamReader(ns);
        ();
        //Check username and password        input = "user " + + "\r\n";
        outbytes = (());
        (outbytes, 0, );       
        readuser = ();
        input = "pass " +  + "\r\n";
        outbytes =(());
        (outbytes, 0, );      
        readpwd = ();              
        if ((0, 3) == "+OK" &amp;&amp; (0, 3) == "+OK")
        { return true; }
        else
        { return false; }
      }
      catch
      {
        return false;
      }
    }
    
    /// &lt;summary&gt;
    /// Determine whether the email format is correct    /// &lt;/summary&gt;
    /// <param name="email">Email address</param>    public bool IsEmail(string email)
    { 
      string paterner = @"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*";
      if (!(email, paterner))
      { return false;}
      else
      {return true;}     
    } 
  }
}