c# - Time stamp missing -

i'm trying display data received on textbox. realized when data being received on br@y terminal fine (eg. 14:02:33.43 > t 11 22.32) running on software time stamp missing.

am missing out lead this?

using system; using system.collections.generic; using system.componentmodel; using system.data; using system.drawing; using system.linq; using system.text; using system.threading.tasks; using system.windows.forms; using system.data.oledb; using system.io;  namespace serialcom { public partial class form1 : form {     string rxstring;  //variable      public form1()     {         initializecomponent();     }       private void btnstart_click(object sender, eventargs e)     {         serialport1.portname = "com4";         serialport1.baudrate = 9600;          serialport1.open();         if (serialport1.isopen)         {             btnstart.enabled = false;             btnstop.enabled = true;             txtdata.readonly = false;         }       }      private void btnstop_click(object sender, eventargs e)     {         if (serialport1.isopen)         {             serialport1.close();             btnstart.enabled = true;             btnstop.enabled = false;             txtdata.readonly = true;         }      }      private void txtdata_keypress(object sender, keypresseventargs e)     {          if (!serialport1.isopen) return;  // if port closed, don't try send character.         char[] buff = new char[8];  // if port open, declare char[] array 1 element.         buff[0] = e.keychar;  // load element 0 key character.         serialport1.write(buff, 0, 1);  // send 1 character buffer.         e.handled = true;// set keypress event handled character won't         // display locally. if want display, omit next line.     }      private void displaytext(object sender, eventargs e)     {         txtdata.appendtext(rxstring);     }      private void serialport1_datareceived(object sender, system.io.ports.serialdatareceivedeventargs e)     {         rxstring = serialport1.readexisting();         this.invoke(new eventhandler(displaytext));          streamwriter mystreamwriter = new streamwriter(@"c:\testing.txt",true);  //true tell sw append file instead of overwriting         mystreamwriter.write(rxstring);         mystreamwriter.flush();         mystreamwriter.close();     }      private void form1_formclosing(object sender, formclosingeventargs e)     {         if (serialport1.isopen)             serialport1.close();     }  } 

}

basically, wrong saying time stamp included in data received.. need add in time stamp on own.. act record of when did received following data.

as result, what's missing this

string time = datetime.now.tostring("dd/mm/yyyy hh:mm:ss.ff") 

hope helps people struggling problem too.