Displaying more than one row using Nusoap/php and visual studio (windowss phone)

[hary4kings]

THE Database is working fine with the php script/nusoap. but if i try to retrieving information about a particular student, visual studio (c#) crashes. I have another code that retrieve only a single row but i want every subject remain about a student. The attach file is the error message from visual studio.
please i need urgent help.

Here is my nusoap/php script 

function GetRemainingSubject($Sid){
       $connect = mysql_pconnect("******","****","*******")
       or die ('could not connect :'. mysql_error());
	   IF ($connect){
		   IF( mysql_select_db('theabani_sg',$connect));{       
  //$sql = ("select Subject_code,SemName,SemYear from enrolment_record where Sid =".$Sid." and Score < 50");
  $sql = ("select Subject_code,SemName,SemYear from enrolment_record,student where student.Sid =enrolment_record.Sid And enrolment_record.Sid = ".$Sid." and Score < 50");
    //  $result = mysql_fetch_array(mysql_query($sql));
        $result = mysql_query($sql);
    
        while($rows = mysql_fetch_array($result)){
       print  $rows['Subject_code']. "<BR>";
       print  $rows['SemName']. "<BR>";
       print  $rows['SemYear']. "<BR>";  
      
      // return $result['Subject_code']."  ".$result['SemName']."  ".$result ['SemYear'];
  } mysql_close($connect);  
   }     } }
   
        $HTTP_RAW_POST_DATA = isset($HTTP_RAW_POST_DATA) ? $HTTP_RAW_POST_DATA : '';
        $server->service($HTTP_RAW_POST_DATA); 
        
?>
       
visual studio code

 private void Button_Click(object sender, RoutedEventArgs e)
        { 
          //  Creating new proxy object of our service;
            MyServicePortTypeClient read = new MyServicePortTypeClient();
            read.GetRemainingSubjectCompleted += new EventHandler<GetRemainingSubjectCompletedEventArgs>(read_GetRemainingSubjectCompleted);
         //   Calling method, as a parameters we type text contained in IdTextBox
         //   but we must change text type of string to integer (ID in web service have integer type)
            read.GetRemainingSubjectAsync(Rbox1.Text);
        
        }

        void read_GetRemainingSubjectCompleted(object sender, GetRemainingSubjectCompletedEventArgs e)
        {
          //  MessageBox.Show(e.Result);
           libox.Items.Add(e.Result.ToString());
          //  libox(e.Result);

        }

    }