Thanks RenteIL for your reminder. I did have tried that way, but still not working. I am not sure why the first index is 0, and then with a constant 10, and last with another index 0. Really confused with the syntax.
Thanks Phil. I just read the online doc and understood the syntax now. I wish there were some sample code in the online doc. I have tried several times last year and this year to search a syntax or some solutions from online documents (including workflow guide, manual etc.) whenever I run into problems, but was disappointed as I couldn’t find any sample code to follow.