Add CEWP into NewForm.aspx

InsertWebPartIntoNewFormPage("http://site/test/", "Lists/SubjectList/NewForm.aspx");


public void InsertWebPartIntoNewFormPage(string siteUrl, string pageFile)
        {  
            using (SPSite site = new SPSite(siteUrl))
            {
                using (SPWeb web = site.OpenWeb())
                {
                    ContentEditorWebPart wp = new ContentEditorWebPart();
                    
                    using (SPLimitedWebPartManager manager = web.GetLimitedWebPartManager(web.Url + pageFile, PersonalizationScope.Shared))
                    {
                        manager.AddWebPart(wp, "Left", 0);
                    }
                }
            }
        }