Update CreatedBy in SharePoint List item

using (var clientContext = new ClientContext(@"http://SP2010:8080/sites/TestSite/"))
            {
                var web = clientContext.Web;
                var lst = web.Lists.GetByTitle("Projects");
                var newUser = clientContext.Web.EnsureUser("Narasimha, Prasad");
                var item = lst.GetItemById(896);
                clientContext.Load(newUser);
                item["Author"] = newUser;
                item["Editor"] = newUser;
                item.Update();
                clientContext.ExecuteQuery();
                MessageBox.Show("Updated Success");
            }

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