public bool TryLookup(RichIdentity richIdentity, IdentityLookupContext context)
        {
            TfsCore core = null;

            lock (m_perMigrationSourceTfsCoresLock)
            {
                if (!m_perMigrationSourceTfsCores.ContainsKey(context.SourceMigrationSourceId))
                {
                    return(false);
                }

                core = m_perMigrationSourceTfsCores[context.SourceMigrationSourceId];
            }

            return(core.TryLookup(richIdentity, context));
        }
        public bool TryLookup(RichIdentity richIdentity, string serverUrl)
        {
            TfsCore core = new TfsCore(serverUrl);

            return(core.TryLookup(richIdentity, null));
        }