public IActionResult AddMarkdownToPage(MarkdownViewModel model)
 {
     //if (model.MarkdownData?.Contains("<script>")==true)
     //{
     //    ModelState.AddModelError("","Unsafe tag <script>...</script>");
     //}
     if (ModelState.IsValid)
     {
         var page = Documentation.Pages.FirstOrDefault(x => x.DocPageID == model.PageID);
         page.Data = model.MarkdownData;
         page.Name = model.PageName;
         Documentation.UpdatePage(page);
         return(LocalRedirect(model.returnUrl));
     }
     return(View(model));
 }