@cheng sy: Please do not post screen-shots or images of text. By doing this you are making our lives harder: we cannot copy-and-paste the text to try it out, we cannot perform text searches, we cannot copy parts into our answer and change a few characters to show what needs to be fixed...
The harder you make it for us to test code or copy text, the harder it is for us to help you.
This forum lets you paste code and format it nicely using the {} Code button, or to upload larger text files and functions, so there is no reason why screen-shots are required to show us any text.
Please do not post text as images!
