Why don't file uploads work during async postbacks?
为什么异步回送时不能使用文件上传？
In general, postbacks occur in one of two ways: through a Submit button or through a script.
通常，postback发生在下面两种方式之一：Submit按钮激发或通过script激发。
Server events occur after postbacks, and they are handled in the server-side code that you write for the page.
伺服器事件会在回传后发生，并且会在为网页所撰写的伺服器端程序码中处理这些事件。
This is because postbacks could be annoying if they are done too often, which at the end will deteriorate the user experience.
这是因为如果他们能做回发，常常是恼人的，它最后会影响用户体验。
This becomes particularly painful when you use data-bound controls, all of which use view state to save their state across postbacks.
当使用数据绑定控件时，所有控件都使用ViewState保存回发后的状态，这将变得异常痛苦。
If you are not doing postbacks in a page or are always regenerating the controls on a page on each request, you should disable view state at the page level.
如果您不发回页，或者总是针对每个请求重新生成页上的控件，则应该在页级别禁用视图状态。
If you are not doing postbacks in a page or are always regenerating the controls on a page on each request, you should disable view state at the page level.
如果您不发回页，或者总是针对每个请求重新生成页上的控件，则应该在页级别禁用视图状态。
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