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public class ComponentVendor
        {
            public ComponentVendor(string name)
            {
                Name = name;
            }

            public string Name { get; set; } 
        }

        public interface IComputerComponent
        {
            ComponentVendor Vendor { get; }

            IEnumerable<IComputerComponent> Parts { get; }

            bool IsCompatibleWith(IComputerComponent component);

            bool IsCanBeHooked(IComputerComponent component);
            void HookUp(IComputerComponent component);
        }

        public abstract class ComputerComponentBase : IComputerComponent
        {
            private readonly List<IComputerComponent> _parts;

            protected ComputerComponentBase(string vendorName, List<IComputerComponent> parts)
            {
                _parts = parts;
                Vendor = new ComponentVendor(vendorName);
            }

            public ComponentVendor Vendor { get; private set; }

            public IEnumerable<IComputerComponent> Parts { get { return _parts; } }

            public abstract bool IsCompatibleWith(IComputerComponent component);

            public virtual bool IsCanBeHooked(IComputerComponent component)
            {
                return 
                    !_parts.Contains(component) && 
                    IsCompatibleWith(component);
            }

            public virtual void HookUp(IComputerComponent component)
            {
                if (IsCanBeHooked(component))
                {
                    _parts.Add(component);
                }
            }
        }

        public class Monitor : ComputerComponentBase
        {
            public double Diagonal { get; set; }

            public Monitor(string vendorName, double diagonal)
                :base(vendorName, new List<IComputerComponent>())
            {
                Diagonal = diagonal;
            }

            public override bool IsCompatibleWith(IComputerComponent component)
            {
                //Выясняем реальный тип аргумента и решаем - совместим ли он с нашим монитором.
                throw new NotImplementedException();
            }
        }

        public class SystemBlock : ComputerComponentBase
        {
            public SystemBlock(string vendorName)
                : base(vendorName, new List<IComputerComponent>())
            {
                //Do nothing
            }

            public override bool IsCompatibleWith(IComputerComponent component)
            {
                //Выясняем реальный тип аргумента и решаем - совместим ли он с нашим
                //системным блоком. Для этого нужно позырить в другие компоненты блока, 
                //и например узнать - совместима ли карта памяти с текущей 
                //уже подключенной материнкой и т.д.
                throw new NotImplementedException();
            }
        }