My apologies.

I tried to post several times with the Notify me of replies and each time,
an error message appeared until I unchecked this option.

Again, sorry.

WindowsIdentity vs User.Identity ??
EventLogPermission via caspol.exe
declarative security and impersonation
Code Source Security
How to share a Principal within a ThreadPool ?
Authenticate domain and local users
Strong-Name Assembly calling WebService
CredUIConfirmCredentials behaves unexpectedly
RSA to PKCS#8
Walking Active Directory