What is the use of the `CodeFile` attribute in an ASP.NET page

Question

What is the use of the CodeFile attribute in an ASP.NET page ?

Answer 1

Fritz Onion probably has one of the best explanations of the CodeFile attribute I've seen:

More details on code behind v2 (PluralSight)

Answer 2

In classic asp we used to write html source and C# or VB code in same file

But in .net 2.0 , we write html code of page in one file and C# or VB code in different file and reference this file in html source of the page using code behind attribute so that compiler know where to find the code for that page

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

here CodeFile="Default.aspx.cs" tells to look for C# code in Default.aspx.cs file

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