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You say .. Let us assume, there is 1 product only in online shopping cart. There are 3 users, they are user1, user2, user3. The three users access one Product A at the same time exactly online. For example
Yes I see the iTextPDF API has encoding but it is not working as per many internet posts I read. iTextPDF is an open-source project. So if you want you can take part in the project and yourself change
As per MSDN API for WinForms I did not spot such a function/loop for the CheckedBoxList control. Generally speaking since an Item in the CheckedBoxList can show a different text to the user but store
The problem is that you are using too many textboxes. I would advise you to limit the number of textboxes to 10 and then check memory and CPU performance and then increase it by 100s and see how it affects
You need to research in Event Driven Programming and how VB handles Event Queues. Also look into the difference between form_load and form_activate events. The application.doevents allows the pending

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