Problem with SharePoint list numbering

meetsea

I'm not very familiar with the secondary development of Sharepoint, I just started. Recently, the company wants to use Sharepoint secondary development to realize the generation of online orders. I don't know how the order number can be automatically filled in the order of the order. For example, the fixed number ws001..ws002..ws003 ... Thank you.

xinqi_0328

You can try to use sharepoint's own list No. number, although you can't add w, but you can simply solve it

zuoxinze

Why can't I find this own list