How to create MULTIPLE ATTACHMENT?

Question

How to create MULTIPLE ATTACHMENT?

Hi everyone in this forum.

I was was creating a user control with a attach file button.
I need this button to upload file from user computer.
After upload 1 file, the file will display and can be delete.
User can click on attach file button to add another file.

So how to make this work?
Firstly, i can't use <INPUT> to browse the file and upload.
Only want to see a button only after click and multiple upload.

Can anyone help in this situation?
Thanks.