The code behind class gets compiled into the main dll for the assembly, and it along with all the other dlls in the applications bin directory get shadow copied to the Temporary ASP.NET files.
那些code behind的类被编译到程序集的主dll中，他和其他的dll一起放在应用程序的bin目录下，拷贝映射到asp.net 临时目录。
The idea behind class wrapping is that a target class can be wrapped in a layer of instrumenting code that retains the same external behavior as the class that's wrapped.
类包装背后的理念是：目标类可以包装在一层插装代码中，后者具有与被包装的类相同的外部行为。
Which will then prompt us for the event handler in our code-behind class to use?
然后就会提示我们在我们的后台代码类中该使用的事件处理函数。
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