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    <p>House class may have a collection of features.</p> <p>You can basicly create an abstract base class called "Feature" or an interface called "IFeature" and inherit/implement it to the class that is meant to be a feature (i.e. <code>Garden</code>).</p> <p>Then all you need to do is creating a collection in <code>House</code> class called "Features".<br> Here is an example interface in C#:</p> <pre><code>interface IFeature { // Properties or methods you want all the features to have. decimal Price { get; } } </code></pre> <p>Your feature classes need to implement <code>IFeature</code> interface.</p> <pre><code>class Garden : IFeature { // This property is needed to implement IFeature interface. public decimal Price { get; private set; } public Garden(decimal price) { Price = price; } } </code></pre> <p>To implement <code>IFeature</code>, a class must have a <code>decimal</code> property called "Price" with a get accessor like the <code>Garden</code> class above and the <code>Pool</code> class below:</p> <pre><code>class Pool : IFeature { public decimal Price { get; private set; } public float Depth { get; private set; } public Pool(decimal price, float depth) { Price = price; Depth = depth; } } </code></pre> <p><code>House</code> class should have a collection of <code>IFeature</code> instead of <code>Pool</code> or <code>Garden</code>:</p> <pre><code>class House { public List&lt;IFeature&gt; Features { get; private set; } public House() { Features = new List&lt;IFeature&gt;(); } } </code></pre> <p>Then, you can add features to a house like this:</p> <pre><code>House h = new House(); h.Features.Add(new Garden(6248.12m)); h.Features.Add(new Pool(4830.24m, 10.4f)); </code></pre> <p>And using LINQ, you can,</p> <pre><code>// Check whether the house has a garden: h.Features.Any(f =&gt; f is Garden); // Get the total cost of features. h.Features.Sum(f =&gt; f.Price); // Get the pools that are deeper than 5 feet. h.Features.OfType&lt;Pool&gt;().Where(p =&gt; p.Depth &gt; 5f); // etc. </code></pre> <p><a href="http://msdn.microsoft.com/en-us/library/ms173156.aspx" rel="nofollow" title="Interfaces (C# Programming Guide) | MSDN">More information about interfaces</a>.<br> <a href="http://msdn.microsoft.com/en-us/library/bb397926" rel="nofollow" title="LINQ (Language-Integrated Query) | MSDN">More information about LINQ</a>.</p>
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    1. COThanks very much for your help!
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