Check my value passing metod is correct or not?

public partial class Login : System.Web.UI.Page
{
   
    public static Double elong1, elat1;

   public static Double Elong1
    {
        get { return Login.elong1; }
        set { Login.elong1 = value; }
    }

       public static Double Elat1
    {
        get { return Login.elat1; }
        set { Login.elat1 = value; }
    }

 public void Button1_Click(object sender, EventArgs e)
    {

String sLong1 = geocodeXmlDoc1.DocumentElement.SelectSingleNode(@"//geometry/location/lat", XmlMngr1).InnerText;
        String sLat1 = geocodeXmlDoc1.DocumentElement.SelectSingleNode(@"//geometry/location/lng", XmlMngr1).InnerText;



elong1 = Convert.ToDouble(sLong1);
elat1 = Convert.ToDouble(sLat1);

}
// this is a sample class
public class harversine
    {

     String loudlong1 = Convert.ToString(elong1);
     String loudlat1 = Convert.ToString(elat1);

       // let say i want pass Fanswer to Textbox in button click event
     String Fanswer = loudlong1 + ", " + loudlat1;

}