How to clear templates cache in IIS?

[navff]

I updated my templates, but there no effect on IIS server. Template files on server have been updated, but there is an old copy of the template somewhere. Restarting IIS have no effect and my email sending by old templates.

public string ConfirmOrderUserMessage(BookViewModelEmail book, MessageFormat format)
        {
            string templateFileName = "order-confirm-user.cshtml"; 
            if (format == MessageFormat.Txt)
            {
                throw new NotImplementedException();
            }
            DynamicViewBag viewBag = new DynamicViewBag();
            viewBag.AddValue("BaseUrl", _baseUrl);

            var p = Path.GetFullPath(Path.Combine(_pathToTemplates, templateFileName));
            var template = File.ReadAllText(p);
            var result = Engine.Razor.RunCompile(template, "ConfirmOrderUserMessage" + format, null, book, viewBag);
            return result;
        }

Some screenshots:
https://i.imgur.com/sqoXd0s.png
https://i.imgur.com/FU233fQ.png

How to force IIS to forget old templates?

[baphamsts]

I got the same with excel, still cannot detect the issue.

[xakml]

我尝试对已缓存的模板进行删除或重新编译,但没找到相关的逻辑或操作方法,不止楼上问题是否已解决?