You need to bind the Picture textbox to a field in your Form.
Did you add a new Field called MyPicture to your CustomerT

The different condition is the picture box I used is the textbox in form not table field

Please correct me if I am not understanding your post correctly.
If I didn't understand you correctly, please try and explain exactly what you are wanting to do in your database.

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You are using the "Pick a File with FileDialog" code from the Code Vault.  
You are wanting to remember the starting folder path for picking your files.  Correct so far?

If that is the case you need to change the line of code:  InitialFolder As String = "" and put in you beginning path between the "".  InitialFolder As String = "C:\MyFiles\"
Change C:\MyFiles\ to the folder path that you want to default to.

Go watch the Images video if you haven't already.  Especially the Extended Cut for Members.

You said, "The different condition is the picture box I used is the textbox in form not table field".

You must have a field in your table to store the path into.
If you don't have a field in your table to store that path to the file name Access will only display that picture while you are on that form.  You will not see it when you leave that record then come back.  
As Alex said above in his reply, you must have a field to store the information in (bound to the form).

Thank a lot for your replying. The reason I decided not to store in field is when I move the WholeRecord Folder, I have to browse all record again. So I decided to Name the picture as recordID and use text box to store folder path that can be browse or change the main folder path
exp. textbox = "C:\Folder\"
       link image = [textbox]&[recordid]&"jpg"
Now I can be able to store the path by fill the textbox control source as ="C:\folder\" but can be done only in design view
Thank again Scott and Alex for all reply and any furthur suggestion

Forgive the questions.  Obviously we have a small issue with our difference in first language.

Do I understand correctly that you want to have the folder separate so that you can change it in the future but still keep the image name the same?

I see that you only have started the Beginner courses.  Would you tell me about your experience with Access?  That will tell me how to answer your questions within your knowledge level.

If you want to be able to change the value of that text box use the default value to store the folder, not the control source. Default value can be edited in form view.