c# - Cannot Update SharePoint Publishing Page Image -

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i trying update publishing page image url somehow after execute query command. value saved null

        clientcontext targetcontext = new clientcontext ("real url");         microsoft.sharepoint.client.file targetfile = targetcontext.web.getfilebyserverrelativeurl ("real url");         var targetpublishingpage = publishingpage.getpublishingpage (targetcontext, targetfile.listitemallfields);         targetcontext.load (targetpublishingpage.listitem);         targetcontext.executequery ();         targetfile.checkout ();         targetpublishingpage.listitem["publishingpageimage"] = "real url";         targetpublishingpage.listitem.update ();         targetcontext.executequery ();

publishing image field value expected specified in folliowing format: <img src='{imageurl}'>

example

using (var ctx = new clientcontext(weburi)) {     var pagefile = ctx.web.getfilebyserverrelativeurl(pageurl);     var pageitem = pagefile.listitemallfields;     pageitem["publishingpageimage"] = "<img src='/publishingimages/pagelogo.png'>";     pageitem.update();     ctx.executequery(); }

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