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 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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