Hi firepol,

The other thread mentions about overridding Umbraco's own membership provider with a custom one, then you can hook into various calls from there.

Quick code snippet would be...

namespace Our.Umbraco
{
    public class CustomUsersMembershipProvider : umbraco.providers.UsersMembershipProvider
    {
        public override bool ValidateUser(string username, string password)
        {
            var success = base.ValidateUser(username, password);

            if (success)
            {
                // do any custom code here!
            }

            return success;
        }
    }
}

You can either drop this in your App_Code, or compile it to your own assembly.

Then replace the current Umbraco membership provider...

<add name="UsersMembershipProvider" type="Our.Umbraco.CustomUsersMembershipProvider" enablePasswordRetrieval="false" enablePasswordReset="false" requiresQuestionAndAnswer="false" passwordFormat="Hashed" />

Now whenever someone logs into the back-office, it would call your code.

Cheers, Lee.