ACTION";
      }
      else
      {
        issue_command("DELE " + msg_number.ToString ());
        temp=read_single_line_response();     
      }
      return(temp);
    }

    public string LIST()
    {
      string temp="";
      if (state != connect_state.TRANSACTION )
      {
        //the pop command LIST is only valid in the TRANSACTION state
        temp="Connection state not = TRANSACTION";
      }
      else
      {
        issue_command ("LIST");
        temp=read_multi_line_response();
      }
      return(temp);     
    }

    public string LIST(int msg_number)
    {
      string temp="";

      if (state != connect_state.TRANSACTION )
      {
        //the pop command LIST is only valid in the TRANSACTION state
        temp="Connection state not = TRANSACTION";
      }
      else
      {
        issue_command ("LIST " + msg_number.ToString ());
        temp=read_single_line_response(); //when the message number is supplied, expect a single line response
      }
      return(temp);

    }

    public string NOOP()
    {
      string temp;
      if (state != connect_state.TRANSACTION )
      {
        //the pop command NOOP is only valid in the TRANSACTION state
        temp="Connection state not = TRANSACTION";
      }
      else
      {
        issue_command ("NOOP");
        temp=read_single_line_response();

      }
      return(temp);

    }
    public string PASS()
    {
      string temp;
      if (state != connect_state.AUTHORIZATION)
      {
        //the pop command PASS is only valid in the AUTHORIZATION state
        temp="Connection state not = AUTHORIZATION";
      }
      else
      {
        if (pwd !=null)
        {
          issue_command ("PASS " + pwd);
          temp=read_single_line_response();

          if (!error)
          {
            //transition to the Transaction state
            state=connect_state.TRANSACTION;
          }
        }
        else
        {
          temp="No Password set.";
        }
      }
      return(temp);
    }
    public string PASS(string password)
    {
      pwd=password;  //put the supplied password into the appropriate property
      return(PASS()); //call PASS() with no arguement
    }

    public string QUIT()
    {
      //QUIT is valid in all pop states

      string temp;
      if (state !=connect_state.disc)
      {
        issue_command ("QUIT");
        temp=read_single_line_response();
        temp += CRLF + disconnect();
 
      }
      else
      {
        temp="Not Connected.";
      }
      return(temp);

    }
    public string RETR (int msg)
    {
      string temp="";
      if (state != connect_state.TRANSACTION )
      {
        //the pop command RETR is only valid in the TRANSACTION state
        temp="Connection state not = TRANSACTION";
      }
      else
      {
        // retrieve mail with number mail parameter
        issue_command ("RETR "+ msg.ToString ());
        temp=read_multi_line_response();
      }
      return(temp);

    }

    public string RSET()
    {
      string temp;
      if (state != connect_state.TRANSACTION )
      {
        //the pop command STAT is only valid in the TRANSACTION state
        temp="Connection state not = TRANSACTION";
      }
      else
      {
        issue_command("RSET");
        temp=read_single_line_response();
      }
      return(temp);

    }

    public string STAT()
    {
      string temp;
      if (state==connect_state.TRANSACTION)
      {
        issue_command("STAT");
        temp=read_single_line_response();

        return(temp);
      }
      else

      {
        //the pop command STAT is only valid in the TRANSACTION state
        return ("Connection state not = TRANSACTION");
      }
    }   

    public string USER()
    {
      string temp;
      if (state != connect_state.AUTHORIZATION)
      {
        //the pop command USER is only valid in the AUTHORIZATION state
        temp="Connection state not = AUTHORIZATION";
      }
      else
      {
        if (user !=null)
        { 
          issue_command("USER "+ user);
          temp=read_single_line_response();
        }
        else
        {  //no user has been specified
          temp="No User specified.";
        }
      }
      return(temp);
    }

    public string USER(string user_name)
    {
      user=user_name; //put the user name in the appropriate propertity
      return(USER()); //call USER with no arguements
    }
    #endregion
  }

}

 

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