请确保以下内容:

1. App_Code文件夹中的类(cs文件)将进行编译.
2.班级是public.
3.如果该类具有名称空间，请确保使用"using"语句将其导入到代码隐藏文件中. 4.确保类文件的方法为public.

希望您的问题能够得到解决.

Make sure the following things:

1. The class (cs file) inside the App_Code folder compiles.
2. The class is public.
3. If the class has a namespace, make sure it is imported in the codebehind file with the "using" statement.
4. Make sure the methods of the class file are public.

Hopefully, your problem will be resolved.

正如您在此问题的主题中恰当提到的那样，网页中包含的名称空间是.如果它们是单独的dll，是否添加了dll参考?

As you have so aptly mentioned in the subject of this question, is the namespace included in the web page. If they are separate dll''s, is the dll reference added?