public SqlSetSingleMultiUserWorker(SqlConnection connection, SqlUserMode mode)
     : base(connection)
 {
     this.mode = mode;
 }
   public SqlSetSingleMultiUserWorker(string server, string database, AuthenticationType authenticationType, string user, string password,
 SqlUserMode mode)
       : base(server, database, authenticationType, user, password)
   {
       this.mode = mode;
   }