Read mail of Inbox using IMAP

In one of my project i need to read all emails and if specified formatted mail is found then Use it.

Below is code to read.

public string IMAP_COMMAND_PREFIX = "IMAP00";
    public int IMAP_COMMAND_COUNT = 0;
    public string IMPAP_SUCCESS_RESPONSE = " OK";
    public string IMAP_NO_RESPONSE = " NO";
    public string IMAP_BAD_RESPONSE = " BAD";
    public string IMAP_COMMAND_EOL = "\r\n";
    public string IMAP_SEARCH_RESPONSE = "* SEARCH ";
    public string IMAP_UNSEEN_FLAG = "unseen";
    public string IMAP_CAPABILITY_COMMAND = "CAPABILITY";
    public string IMAP_LOGIN_COMMAND = "LOGIN";
    public string IMAP_LOGOUT_COMMAND = "LOGOUT";
    public string IMAP_SELECT_COMMAND = "SELECT INBOX";
    public string IMAP_SEARCH_COMMAND = "SEARCH";
    public string IMAP_UIDFETCH_COMMAND = "UID FETCH";
    public string IMAP_BODYSTRUCTURE_COMMAND = "BODYSTRUCTURE";
 protected void Page_Load(object sender, EventArgs e)
 {
  try {
   TcpClient tcpclient = new TcpClient(); // create an instance of TcpClient
   string strCommand = string.Empty;
   tcpclient.Connect("host name", 143); // HOST NAME IAMP SERVER and port number 143 for POP 
   Stream sslstream = tcpclient.GetStream();
   System.IO.StreamWriter sw = new StreamWriter(sslstream); // Asssigned the writer to stream
   System.IO.StreamReader reader = new StreamReader(sslstream); // Assigned reader to stream
   strCommand = IMAP_COMMAND_PREFIX + IMAP_COMMAND_COUNT.ToString() + " " + IMAP_CAPABILITY_COMMAND + IMAP_COMMAND_EOL;
    ReadResonse(reader, strCommand, sw);
    strCommand = IMAP_COMMAND_PREFIX + IMAP_COMMAND_COUNT.ToString() + " " + IMAP_LOGIN_COMMAND + " " + "EmailAddressID" + " " + "Email Password";
     ReadResonse(reader, strCommand, sw);
     strCommand = IMAP_COMMAND_PREFIX + IMAP_COMMAND_COUNT.ToString() + " " + IMAP_SELECT_COMMAND + IMAP_COMMAND_EOL;
      ReadResonse(reader, strCommand, sw);
      strCommand = IMAP_COMMAND_PREFIX + IMAP_COMMAND_COUNT.ToString() + " " + IMAP_SEARCH_COMMAND + " " + IMAP_UNSEEN_FLAG + IMAP_COMMAND_EOL;
      ReadResonse(reader, strCommand, sw);
      strCommand = IMAP_COMMAND_PREFIX + IMAP_COMMAND_COUNT.ToString() + " " + IMAP_SEARCH_COMMAND + " " + IMAP_LOGOUT_COMMAND + IMAP_COMMAND_EOL;
      ReadResonse(reader, strCommand, sw);

        }
        catch (Exception ex)
        {
        }

    }
    public void ReadResonse(StreamReader reader, string strCommand, StreamWriter swriter)
    {
        try
        {
            swriter.WriteLine(strCommand);
            swriter.Flush();
            bool IsLastSuccess = false;
            string strResponse = string.Empty;
            while ((strResponse = reader.ReadLine()) != null)
            {

                if (strResponse.StartsWith(IMAP_COMMAND_PREFIX + IMAP_COMMAND_COUNT.ToString() + IMPAP_SUCCESS_RESPONSE)) // find the success character in line
                {
                    break;
                }
                else if (strResponse.StartsWith(IMAP_COMMAND_PREFIX + IMAP_COMMAND_COUNT.ToString() + IMAP_NO_RESPONSE)) // find the failure character in line
                {

                    break;
                }
                else if (strResponse.StartsWith(IMAP_COMMAND_PREFIX + IMAP_COMMAND_COUNT.ToString() + IMAP_BAD_RESPONSE)) // find the failure character in line
                {
                    break;
                }
                else if (strResponse.StartsWith(IMAP_COMMAND_PREFIX + IMAP_COMMAND_COUNT.ToString() + IMAP_BAD_RESPONSE)) // find the failure character in line
                {
                    break;
                }
                else if (strResponse.StartsWith(IMAP_SEARCH_RESPONSE)) // find the unread mail
                {
                    string strTempUnread = strResponse.Substring(strResponse.IndexOf(IMAP_SEARCH_RESPONSE) + IMAP_SEARCH_RESPONSE.Length);
                    string[] strArray = strTempUnread.Split(" ".ToCharArray());
                    string strSearch = string.Empty;
                    while ((strSearch = reader.ReadLine()) != null)
                    {
                        if (strSearch.StartsWith(IMAP_COMMAND_PREFIX + IMAP_COMMAND_COUNT.ToString() + IMPAP_SUCCESS_RESPONSE))
                        {
                            IsLastSuccess = true;
                            break;
                        }
                    }

                    for (int i = 0; i < strArray.Length; i++)
                    {

                           //read header of email
                        swriter.WriteLine(IMAP_COMMAND_PREFIX + i.ToString() + " " + "FETCH " + strArray[i].ToString() + " BODY[HEADER.fields (from)]\r\n"); // this will retrive your first email 
                        swriter.Flush();
                        string strTemp = string.Empty;
                        while ((strTemp = reader.ReadLine()) != null)
                        {
                            if (strTemp.StartsWith(IMAP_COMMAND_PREFIX + i.ToString() + IMPAP_SUCCESS_RESPONSE))
                            {
                                break;
                            }
                            else if (strTemp.StartsWith(IMAP_COMMAND_PREFIX + i.ToString() + IMAP_NO_RESPONSE)) // find the failure character in line
                            {

                                break;
                            }
                            else if (strTemp.StartsWith(IMAP_COMMAND_PREFIX + i.ToString() + IMAP_BAD_RESPONSE)) // find the failure character in line
                            {
                                break;
                            }
                            else if (strTemp.StartsWith(IMAP_COMMAND_PREFIX + i.ToString() + IMAP_BAD_RESPONSE)) // find the failure character in line
                            {
                                break;
                            }                           

                        }

// read body of email
                        swriter.WriteLine(IMAP_COMMAND_PREFIX + i.ToString() + " " + " FETCH " + strArray[i].ToString() + " BODY[TEXT]\r\n"); // this will retrive your first email 
                        swriter.Flush();
                        while ((strTemp = reader.ReadLine()) != null)
                        {
                            if (strTemp.StartsWith(IMAP_COMMAND_PREFIX + i.ToString() + IMPAP_SUCCESS_RESPONSE))
                            {
                                break;
                            }
                            else if (strTemp.StartsWith(IMAP_COMMAND_PREFIX + i.ToString() + IMAP_NO_RESPONSE)) // find the failure character in line
                            {

                                break;
                            }
                            else if (strTemp.StartsWith(IMAP_COMMAND_PREFIX + i.ToString() + IMAP_BAD_RESPONSE)) // find the failure character in line
                            {
                                break;
                            }
                            else if (strTemp.StartsWith(IMAP_COMMAND_PREFIX + i.ToString() + IMAP_BAD_RESPONSE)) // find the failure character in line
                            {
                                break;
                            }
                        }

             }
}
   if (IsLastSuccess == true)
                    break;
 }

            IMAP_COMMAND_COUNT++;
        }
        catch (Exception ex)
        {
            log4net.ILog logger = log4net.LogManager.GetLogger("File");
            logger.Error("Lead Convertor + ReadResonse :" + ex.Message);
        }
    }
}

Beloow link for IMAP Commands http://bobpeers.com/technical/telnet_imap.php
Happy coding :-)