C#

var zfullname, zphone_M, zphone_F,  zMail, zFname,zLname;
       var ALL;
       var  Fname, Lname, Phone_M, Phone_F,  Mail;

       function XX() {
           if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari
               xmlhttp = new XMLHttpRequest();
           }
           else {// code for IE6, IE5
               xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
           }
           xmlhttp.open("GET", "Phone.xml", false);
           xmlhttp.send();
           xmlDoc = xmlhttp.responseXML;

           $("#ZIZI").empty();

           var x = xmlDoc.getElementsByTagName("MEN");
           for (i = 0; i < x.length; i++) {

               try { Fname = x[i].getElementsByTagName("Fname")[0].childNodes[0].nodeValue; }
               catch (err) { Fname = "0"; }
               try { Lname = x[i].getElementsByTagName("Lname")[0].childNodes[0].nodeValue; }
               catch (err) { Lname = "0"; }
               try { Phone_M = x[i].getElementsByTagName("Phone_M")[0].childNodes[0].nodeValue; }
               catch (err) { Phone_M = "0"; }
               try { Phone_F = x[i].getElementsByTagName("Phone_F")[0].childNodes[0].nodeValue; }
               catch (err) { Phone_F = "0"; }
               try { Mail = x[i].getElementsByTagName("Mail")[0].childNodes[0].nodeValue; }
               catch (err) { Mail = "0"; }

               if (Mail == "0") Mail = "&nbsp;";
               if (Phone_M == "0") Phone_M = "&nbsp;";
               if (Phone_F == "0") Phone_F = "&nbsp;";

               ALL =
                     '<li >' +

                     '<a href="men.html" data-transition="flip">' +
                        '<div class="ui-grid-a" id="restau_infos"> ' +
                               '<p style="font-size:22px; margin:0px;padding:0px;" class="nam"><b>' + Fname + " " + Lname +  '</b></p>' +
                               '<p style="font-size:16px; margin:0px;padding:0px;" class="phn">' + Phone_M + '</p>' +
                               '<p style="font-size:16px; margin:0px;padding:0px;" class="phn2">' + Phone_F + '</p>' +
                               '<p style="font-size:14px; margin:1px;padding:1px;" class="crr">' + Mail + '</p>' +
                        ' </div>' +
                     '</a>' +
                     '<a href="tel:' + Phone_M + '  data-icon="location" ></a>' +
                     '</li>'

               $("#ZIZI").append(ALL);
               $("#ZIZI").listview("refresh");
           }
       }

string SQL;
       DataSet dsView;

       [WebMethod]
       [ScriptMethod(ResponseFormat = ResponseFormat.Xml)]
       public DataSet GetData( string sel)
       {

           dsView = new DataSet();
           MyParam.OpenConnection();
           SQL = "select Fname,Lname,S_phone from MEN where sel = '" + sel + "'";
           dsView = new DataSet();
           MyParam.adp = new SqlDataAdapter(SQL, MyParam.Conn);
           MyParam.adp.Fill(dsView, "MEN");
           MyParam.adp.Dispose();
           if (dsView.Tables["MEN"].Rows.Count >= 1)
           {
               return dsView;
           }
           else
           {
               return null;
           }
       }

static class Parameters
{
  private static int x1; // only getters of x1 and x2 will be visible to outside world
  private static int x2;  
  private static bool isInit;
  private static readonly object Locker = new object();

  public static bool isInited()
  {
   lock(Locker)
    {
    return isInit;
    }
  }

  public static int X1()
  {
    if(!isInited()) throw new Exception("init first");
    return x1;
     
  }

  public static int X2()
  {
    lock(Locker)
    {
     if(!isInited()) throw new Exception("init first");
     return x2;
    }
    
  }

  public static void init(int x, int y)
  {
    lock(Locker)
    {
      if(isInit) return;
      isInit = true;
      x1 = x;
      x2 = y; 
    }
  }

  public static void Deinit()
  {

    lock(Locker)
    {
      if(!isInit) return;
      isInit = false;
      x1 = 0;
      x2 = 0;
    }
  }


}