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| In code-behind mode, two classes are automatically generated First:
 It is partial, which only contains the declaration code of the page control; the class name is consistent with the class name in the code-behind file, for example: MyPage;
 
 Two places:
 The class name is similar to webform1_aspx, which is a subclass of MyPage in the first above. The main logic of the code is to generate a control tree.
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