PeerCollaborationPermissionAttribute
Allows security actions for  PeerCollaborationPermission to be applied to code using declarative security. This class cannot be inherited.
                using System.Security;
using System.Security.Permissions;
namespace System.Net.PeerToPeer.Collaboration
{
    [AttributeUsage(AttributeTargets.Assembly | AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Constructor | AttributeTargets.Method, AllowMultiple = true, Inherited = false)]
    public sealed class PeerCollaborationPermissionAttribute : CodeAccessSecurityAttribute
    {
        public PeerCollaborationPermissionAttribute(SecurityAction action)
            : base(action)
        {
        }
        public override IPermission CreatePermission()
        {
            return null;
        }
    }
}