I am working with SharePoint Online(Office 365). I have some Excel files uploaded in a SharePoint library and I need to update one of the file data using c# code. My solution in Sandbox solution.
I already tried to update the file using the Open XML 2.0 framework (from the openXml 2.0 dll) but its not working properly.
Can anyone provide any guidance on the matter? Which would be the simpliest way to accomplish this?