在asp.net.cx中多次调用web url

I am trying to call a web URL which contain parameters lat and long, and I want to call that web page multiple times until the asp application closes.

I am recieving the values whenever the aspx page is loaded but for getting updated values I have to refresh the page to call the page_Load function again and again.

What I want is to get values from the url again and again without refreshing the aspx page.

//my code of my aspx.cs file

public partial class locationtesting : System.Web.UI.Page
{
  public string longit, lat;
  protected void Page_Load(object sender, EventArgs e)
  {
    try
    {
        WebClient client = new WebClient();
        string downloadedString = client.DownloadString("url.php");
        string[] tokens = downloadedString.Split(':');
        string longitude = tokens[1];
        string latitude = tokens[3];

        this.longit = longitude;
        this.lat = latitude;

    }
    catch (Exception ee)
    {
        Response.Write("Exception: "+ee);
    }
  }
}