I tried to create a visual web part and publish it to SharePoint online:

I created a visual web part at local using SharePoint server 2016 and to publish to SharePoint online, I selected "Sandboxed Solutions".

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I tried to run test at local and publish to SP Online, but both throws errors:


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Can I create visual web part for SharePoint online in SharePoint 2016?

1 Answer 1


Code based sandbox solutions contain server-side code and the solution contains .Net assembly file (.dll). SharePoint online doesnot support Code-based sandbox solutions.

You could transform sandbox solutions to the SharePoint Add-in model:


  • But sharepoint add-in is a application or a page, it is not a part of page. can't create a webpart for SP Online by visual studio?
    – D T
    Commented Jan 12, 2021 at 8:47
  • For SharePoint online, we can only create client-side web parts: docs.microsoft.com/en-us/sharepoint/dev/spfx/web-parts/… Commented Jan 12, 2021 at 9:03
  • Thank you, your information.
    – D T
    Commented Jan 12, 2021 at 9:43
  • If my answer helps you, please accept it :) Commented Jan 13, 2021 at 1:02

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