Send Data From Arduino to ASP.NET

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C#

ASP.NET

Javascript

Arduino

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Please help me ,
I have a problem regarding valiable calling from c # to javascript in asp.net .
how to perform real-time retrieval of Arduino uno without wifi shileld through C # then passed to the javascript that will be displayed on the web . where the transmitted data is worth " 0 " and " 1 " continuously.

for example :

Arduino code :
void setup ( ) {
  / / Initialize the digital pin as an output .
      
}

void loop ( ) {
  Serial.write ( " 1 " ) ;
  delay (1000 ) ;
 Serial.write ( " 0 " ) ;
  delay (1000 ) ;
}


C # Code
 public String msg ;
 public void DataReceivedHandler ( object sender , SerialDataReceivedEventArgs e ) {
            SerialPort sp = ( SerialPort ) sender ;
            indata string = sp.ReadExisting ( ) ;

            msg = indata ;

           
        }

Javascript code
 SaySomethingToUnity function ( ) {
                 a = < % = msg % >
                 alert ( a) ;
                 u.getUnity ( ) . SendMessage ( " Main Camera " , " note_c " , a) ;
                      
             }