How to add code behind file to existing page

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If you have an existing page that uses code inline and want to associate a code file with it, do the following:

1. Assuming that name of the page is Foo.aspx, create a new code file named Foo.aspx.vb in the same directory.

2. Change page directive to

<%

@ Page Language="VB" AutoEventWireup="false" CodeFile="Foo.aspx.vb" Inherits="Foo" %>

3. Close and reopen the solution or Web site.

The code file should now correctly show up in the Solution Explorer as a subnode of the page file.