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private static List<User> Users
{
    get
   {
       if (_customers == null) {             _customers = new List<Customer>(); }
        lock (((ICollection)_customers).SyncRoot)
       {
                return _customers;
       }
}
set
  {
      lock (((ICollection)Customer).SyncRoot)
      {
            _customers = value;
       }
   }
                                    
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