I'm working on an app to provision design elements to SharePoint Online. My project is relying on extension methods in OfficeDevPnPCore. This library references v16 of Microsoft.SharePoint.Client. I need to AlternateCssUrl and SiteLogoUrl. These are fairly new (2014 April CU, according to a comment in PnP) and the recommended way to perform branding in SPO, as far as I understand. But I can only find these methods in v15 of Microsoft.SharePoint.Client. The problem is that if I reference v15 in my project, I can't compile it, since it also includes a reference to OfficeDevPnPCore and v16. How can I solve this situation?

2 Answers 2


In the latest version (16.0.3104.1200) of SharePoint Online Client Components SDK available for download currently, Web object exposes AlternateCssUrl and SiteLogoUrl properties:

using (var context = new ClientContext(webUri))
     var web = context.Web;
     web.AlternateCssUrl = web.ServerRelativeUrl + "/SiteAssets/contoso.css";
     web.SiteLogoUrl = web.ServerRelativeUrl + "/SiteAssets/99x.png";
  • Vadim: do you by any chance know if and which CU for on-premises contains the required REST API changes to make the above code work for SP on-premises installations? TIA!
    – Sig Weber
    Commented Sep 23, 2014 at 21:32
  • Sig, it seems it was added in 2014 April CU for on-premises, github.com/OfficeDev/PnP/tree/master/Samples/… Commented Sep 23, 2014 at 21:38
  • 1
    Thanks Vadim. FYIO: the link you pointed me to mentions a June 30th 2014 release date. Couldn't find it when I asked in August, though sharepoint.stackexchange.com/questions/113238/…
    – Sig Weber
    Commented Sep 23, 2014 at 21:54
  • 2
    Oh, I did not know there was a separate SDK for SharePoint Online. I had already updated the normal one, but missed this one. Installing it solved my problem. Thank you!
    – rlv-dan
    Commented Sep 24, 2014 at 5:24

I'm guessing you don't have the v16 DLLs on your system, or you have an old version. If so, delete and re-install the Client Components SDK

They change fairly frequently so if things start breaking or failing to compile check for a new version.

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