private async void InsertComment(comments c)
 {
     try
     {
         var   call = commentTable.InsertAsync(c);
         await call;
         if (call.IsFaulted)
         {
             MessageBox.Show("Comment add failed");
         }
         if (call.IsCompleted)
         {
             MessageBox.Show("Comment add success");
         }
         if (call.IsCanceled)
         {
             MessageBox.Show("Comment add cancelled");
         }
     }
     catch (MobileServicePreconditionFailedException)
     {
         MessageBox.Show("Comment add failed");
     }
     //items.Add(u);
 }
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            comments temp = new comments();

            temp.loc_lat       = lat;
            temp.loc_lng       = lng;
            temp.username      = uname;
            temp.commentposted = tbCom.Text;
            InsertComment(temp);
        }