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.NET 4.0 Framwork problem

I am having problems with code as simple as this:

   protected void Page_Load(object sender, EventArgs e)
        Response.Write("Current User: <strong>" + System.Environment.UserName + "</strong><br><br>");
        Response.Write("Current User: <strong>" + HttpContext.Current.User.Identity.Name.ToString() + "</strong>");

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If I have it on an application pool that uses .NET 2.0, it works fine. If I change the .NET to 4.0 it doesn't work any more.

Please help.
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what is "doesn't work any more"? errors?
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I change it to 4.0 application pool and reload the page and get this:

Server Error
500 - Internal server error.
There is a problem with the resource you are looking for, and it cannot be displayed.
The only thing I change in IIS is the version of .NET that the application pool is using and then I get the error mentioned above. What could be causing this?
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I found this answer somewhere else.