public static SinglePageDataSet GetData()
 {
     string filename = HttpContext.Current.ApplicationInstance.Server.MapPath(filelink);
     SinglePageDataSet data = new SinglePageDataSet();
     try
     {
         if (File.Exists(filename))
         {
             data.ReadXml(filename);
         }
     }
     catch
     {
     }
     return data;
 }
 public static void SaveData(SinglePageDataSet data)
 {
     string filename = HttpContext.Current.ApplicationInstance.Server.MapPath(filelink);
     data.WriteXml(filename);
 }