Decal.Filters.FileService fs = CoreManager.Current.FileService as Decal.Filters.FileService;

            Decal.Interop.Filters.SkillInfo skillinfo = null;
            for (int i = 0; i < fs.SkillTable.Length; ++i)
            {
                try
                {
                    skillinfo = Core.CharacterFilter.Underlying.get_Skill((Decal.Interop.Filters.eSkillID)fs.SkillTable[i].Id);
                    //Do stuff with skill
                }
                finally
                {
                    if (skillinfo != null)
                    {
                        System.Runtime.InteropServices.Marshal.ReleaseComObject(skillinfo);
                        skillinfo = null;
                    }
                }
            }