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copied!<p><strong>.NET 4+</strong></p> <pre><code>IList<string> strings = new List<string>{"1","2","testing"}; string joined = string.Join(",", strings); </code></pre> <p><strong>Detail & Pre .Net 4.0 Solutions</strong></p> <p><code>IEnumerable<string></code> can be converted into a string array <em>very</em> easily with LINQ (.NET 3.5):</p> <pre><code>IEnumerable<string> strings = ...; string[] array = strings.ToArray(); </code></pre> <p>It's easy enough to write the equivalent helper method if you need to:</p> <pre><code>public static T[] ToArray(IEnumerable<T> source) { return new List<T>(source).ToArray(); } </code></pre> <p>Then call it like this:</p> <pre><code>IEnumerable<string> strings = ...; string[] array = Helpers.ToArray(strings); </code></pre> <p>You can then call <code>string.Join</code>. Of course, you don't <em>have</em> to use a helper method:</p> <pre><code>// C# 3 and .NET 3.5 way: string joined = string.Join(",", strings.ToArray()); // C# 2 and .NET 2.0 way: string joined = string.Join(",", new List<string>(strings).ToArray()); </code></pre> <p>The latter is a bit of a mouthful though :)</p> <p>This is likely to be the simplest way to do it, and quite performant as well - there are other questions about exactly what the performance is like, including (but not limited to) <a href="https://stackoverflow.com/questions/219519/whats-the-c-method-syntax-for-converting-an-array-to-a-simple-string">this one</a>.</p> <p>As of .NET 4.0, there are more overloads available in <a href="http://msdn.microsoft.com/en-us/library/system.string.join" rel="noreferrer"><code>string.Join</code></a>, so you can actually just write:</p> <pre><code>string joined = string.Join(",", strings); </code></pre> <p>Much simpler :)</p>

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