public IInsertCommandBeforeOrAfterTargetSyntax InsertContent(string html)
        {
            if (html == null)
            throw new ArgumentNullException("html");

              var commandBuilder = new InsertCommandBuilder(this);
              commandBuilder.SetContent(html);
              return commandBuilder;
        }
        public IInsertCommandBeforeOrAfterTargetSyntax InsertContent(PartialViewResult partialViewResult)
        {
            if (partialViewResult == null)
            throw new ArgumentNullException("partialViewResult");

              var commandBuilder = new InsertCommandBuilder(this);
              commandBuilder.SetContent(partialViewResult);
              return commandBuilder;
        }