Grant permission to access Internet

[Elliot]

Any idea to grant my program permission to access Internet(XML file on the
Internet) except using .NET Framework Configuration?

I have tried

http://msdn.microsoft.com/en-us/library/system.net.webpermission.aspx

but it seems not work.

The following message shown when executing my Messenger Add-in:
Request for the permission of type 'System.Net.Web Permission,
System, Version=2.0.0.0 , Culture=neutral ,
PublicKeyToken= b77a5c561934e08 9' failed.