c# - Properly set a list of COM objects to a new value -

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suppose have list of com objects property in class : 

public list<legacycomobjects> legacycomobjects { get; set; }

what best way set property new value? should classic .net way or should release objects before setting because memory leaks may happen? think of : 

private list<legacycomobjects> _legacycomobjects ;  public list<legacycomobjects> legacycomobjects      {         { return _legacycomobjects; }         set              {                  if (_legacycomobjects!= null)                 {                     _legacycomobjects.foreach(o =>                     {                         marshal.releasecomobject(o);                         o = null;                     });                 }                 _legacycomobjects= value;              }     }


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