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    <p>Why not have a <a href="http://msdn.microsoft.com/en-us/library/sf985hc5%28v=vs.71%29.aspx" rel="nofollow">base class</a> that has <code>Output</code> defined. Then return the base.</p> <pre><code>public abstract class BaseType { public abstract void Output(); } </code></pre> <p>Both <code>Articles</code> and <code>Questionaire</code> should inherit this <code>BaseType</code>.</p> <pre><code>public class Articles : BaseType { // Output method here } public class Questionaire : BaseType { // Output method here } </code></pre> <p>Then you can do:</p> <pre><code>public static BaseType Choose(int x, string name) { if (x == 1) { Articles art = new Articles(name); return art; } if (x == 2) { Questionnaire ques = new Questionnaire(name); return ques; } } </code></pre> <p>You could also achieve this via an <a href="http://msdn.microsoft.com/en-us/library/87d83y5b%28v=vs.110%29.aspx" rel="nofollow"><code>interface</code></a>.</p> <pre><code>public interface IInterface { void Output(); } public class Articles : IInterface { // Output method here } public class Questionaire : IInterface { // Output method here } </code></pre> <p>You would then have to modify the Choose method to return <code>IInterface</code> rather than <code>BaseType</code>. Whichever you choose is up to you. </p> <p>Note: even if you can't change original classes you can still use these approaches before resorting to <code>dynamic</code> by providing wrapper classes that implement the interface and either inherits original or forwards calls to corresponding method:</p> <pre><code>public class ArticlesProxy : Articles, IInterface { public ArticlesProxy(string name) : base(name){} } public class QuestionaireProxy : Questionaire, IInterface { Questionaire inner; public QuestionaireProxy(string name) { inner = new Questionaire(name); } public void Output() { inner.Output();} } </code></pre>
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    1. COA good pratice is either use a base type, like an Printable class, per example or an interface like IPrintable.
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    2. CO+1 as it is just as valid as an interface.
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      1. USMike Perrenoud
    3. COKeeping in mind that I used that name so it relates to your classes
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