Visual Studio creation of WebForms vs Blank Files

When trying to write the codebehind file for its associates aspx page a colleague and I were stumped as to why the Controls within file.aspx were not appearing in the codecompletion, nor were they compiling without error.

When i created the file.aspx and file.aspx.cs I had created these items as blank files, the file.aspx.cs build action was set to Compile while the file.aspx Build Action was Content.

We created a new "webform" item that automatically generated the SecondFile.aspx and the SecondFile.asp开发者_开发问答x.cs file and associated them. We copied the HTML and code from file to SecondFile and the code completion worked, and the codeBehind compiled correctly.

Why?

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You have not included enough information, but I think you might have forgot to put the page declaration at the top of your .aspx file

<%@ Page Language="C#" CodeFile="file.aspx.cs" Inherits="my_ascx_class_name" %>