Source: Microsoft Support

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Problem:













When debugging a VS 2008 application running on framework 2.0 or 3.5, pressing F5 can case this error message to be thrown:













Request for the permission of type ‘system.Security.Permissions.FileIOPermission, mscorlib, version-2.O.O.O, Culture=neutral, PublicKeyToken-b77a5c561934e069’ failed.

















            Even though the application was running from local machine and the project also on local machine with fulltrust.  If the application.exe is executed, it works fine.


 







 

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  When debugging an application in VS 2008 by pressing F5 this error message might be thrown:





Request for the permission of type ‘system.Security.Permissions.FileIOPermission, mscorlib, version-2.O.O.O, Culture=neutral, PublicKeyToken-b77a5c561934e069’ failed.

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The FileIOPermission exception is thrown due to a corrupted application.vshost.exe file generated from the debugger in the IDE. 

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The issue can be resolved by unchecking the "Enable the Visual Studio hosting process" in the project properties, then rebuild the project and then re-enabling the VS hosting process and rebuilding the project. 

Project Properties->Debug-> uncheck "Enable the Visual Studio hosting process"

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How to: Disable the Hosting Processhttp://msdn2.microsoft.com/en-us/library/ms185330.aspx (http://msdn2.microsoft.com/en-us/library/ms185330.aspx)

Hosting Process (vshost.exe)
http://msdn2.microsoft.com/en-us/library/ms185331.aspx (http://msdn2.microsoft.com/en-us/library/ms185331.aspx)

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