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."; 
                } 
            } 
  &nb

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