{
	"@odata.context": "http://portal.xpertdoc.com/odata4/v6/$metadata#StyleSheets/$entity",
	"StyleSheetId": "00000000-0000-0000-0000-0000000000003",
	"Name": "bcbsal",
	"Description": null,
	"Content": "",
	"CreatedByUserProfileId": "00000000-0000-0000-0000-000000000000",
	"CreatedDate": "2016-01-01T00:00:00.0000000Z",
	"ModifiedByUserProfileId": "00000000-0000-0000-0000-000000000000",
	"ModifiedDate": "2016-01-01T00:00:00.0000000Z",
	"Timestamp": "AAAAAAAEqkg="
}

var styleSheet = portalContext.StyleSheets.Where(s => s.StyleSheetId == Guid.Parse("00000000-0000-0000-0000-000000000000")).FirstOrDefault();	
	
styleSheet.Name = "New Name";
styleSheet.ValueToChange = value;
	
portalContext.UpdateObject(styleSheet);
portalContext.SaveChanges();