System.Net.WebPermission 4.0 framework issue

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While changing the .net frame work from 3.5 to 4.0 on a project the System.Net.WebPermission object is now throwing exceptions. It appears to happen on the Assert() method. I pasted all the usuals below. When it's recompiled in 3.5 it works as usual.
I can not find any documentation in the 4.0 library on MSDN, has it moved, could the program be missing a reference when compiled with 4.0?

WebPermission myWebPermission =
new WebPermission(System.Security.Permissions.PermissionState.Unrestricted);

myWebPermission.Demand();
myWebPermission.Assert();

ex message
Cannot perform CAS Asserts in Security Transparent methods

- Current
'(myWebPermission.ConnectList).Current'
threw an exception of type 'System.InvalidOperationException'
object {System.InvalidOperationException}

"Enumeration has not started. Call MoveNext."

Posted 22-Oct-13 8:18am

MainFrameMan_ALIVE_AND_WELL$$

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MainFrameMan_ALIVE_AND_WELL$$ 23-Oct-13 11:12am

maybe a little more information: this is a call from a desktop application. It is doing what they used to call 'screen scraping', go figure. It logs on the the website and removes all the html tags/characters. Parses out the specifice data between the tags and then displays it. Don't ask me why, I won't be able to explain to you the misery; I guess there is no web service available. I went and read the article in the answer, thanks, I have no idea what this means, I don't do Web stuff. I do understand what the permissions is all about, but what changed with using the different frameworks?

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phil.o · Answer 1 · 2013-10-22T08:33:00

This article:
.NET 4 Security - Transparent vs Critical: How to use AppDomain.SetData on a Medium Trusted App?[^]
enlights new security aspects with .NET & ASP.NET 4 security implementation.

You may run your IIS site in a restricted security mode, which prevents you from using the System.Security.Permissions.PermissionState.Unrestricted that you want to.

Hope this helps.