public static long GetNewDeviceTag()
 {
     using (HellolingoEntities db = new HellolingoEntities()) {
         var objParam = new ObjectParameter("newDeviceTag", typeof(long));
         db.Configuration_GetNewDeviceTag(objParam);
         return((long)objParam.Value);
     }
 }
        public async Task UntagUser(int userId, int tagId)
        {
            using (var db = new HellolingoEntities()) {
                var user = await db.Users.FindAsync(userId);

                var tagValue = await db.UsersTagsValues.FindAsync(tagId);

                user.Tags.Remove(tagValue);
                await db.SaveChangesAsync();
            }
        }