Getting Latitude and logitude of User based on location

 This is my ajax script for getting user latitude and logitude based on location it is working properly in my localhost but in my beta application unable to get the values pls help me to fix it any other suggestion pls thanks in advance.
 

 public static  string Latitude;
        public static  string Longitude;


 [WebMethod]
        public static void SaveLocation(string latitude, string longitude)
        {
            Latitude = latitude;
            Longitude = longitude;
        }