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User.Identity.Name;                    

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Benutzer/ÜbergreifendeGruppe/Gruppe/SpezielleGruppe/"User.Identity.Name"                    

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        public string GetObjectDistinguishedName(string objectName, string LdapDomain)
        {
            string distinguishedName = string.Empty;
            string connectionPrefix = "LDAP://" + LdapDomain;
            DirectoryEntry entry = new DirectoryEntry(connectionPrefix);
            DirectorySearcher mySearcher = new DirectorySearcher(entry);

            mySearcher.Filter = "(&(objectClass=user)(|(cn=" + objectName + ")(sAMAccountName=" + objectName + ")))";
            SearchResult result = mySearcher.FindOne();

            if (result == null)
            {
                throw new NullReferenceException
                ("unable to locate the distinguishedName for the object " +
                objectName + " in the " + LdapDomain + " domain");
            }
            DirectoryEntry directoryObject = result.GetDirectoryEntry();
            distinguishedName = "LDAP://" + directoryObject.Properties["distinguishedName"].Value;
            entry.Close();
            entry.Dispose();
            mySearcher.Dispose();
            return distinguishedName;
        }