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How to create a custom ribbon that execute a custom action in a sharepoint library Ribbon c#?
How to create a custom ribbon that execute a custom action in a sharepoint library Ribbon programatically?
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I'm assuming that you are using Office 365 and that you will want to use CSOM:
https://lixuan0125.wordpress.com/2014/03/04/add-custom-action-through-csom-with-app/
