Usercontrol In SharePoint - Security Exception

Apr 5, 2012

I'm developing a usercontrol to use in SharePoint, and I think I need to use framework 3.5.

If I create a new web application targeting 3.5 and try to run it, I get this:

Code:
[SecurityException: Request for the permission of type 'System.Web.AspNetHostingPermission, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.]

I'm using file system run locally

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