如果您使用的主机不允许\支持自定义默认文档，只需创建您网站上的default.aspx页面，它会重定向到您想要的默认页面。

If the host you are using doesn't allow\support custom default documents just create a default.aspx page on your site that does a redirect to your desired default page.

我已将我的网站上传到smartasp.net主机

I have uploaded my site to smartasp.net hosting

您必须与他们的支持人员交谈。如果有人知道你能做什么以及如何做，那就是他们。

You have to talk with their support. If someone know what you can do and how, it is them.