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    <p>Don't create a new instance of <code>Random</code> on each iteration - that's going to seed each instance with the current time in milliseconds, which obviously isn't likely to change between iterations.</p> <p>Create a single instance of <code>Random</code>, and pass it into the method. I'd also advise you not to concatenate strings like that in a loop, or even to create that many strings. Additionally, if you use <code>Random.Next(int, int)</code> to make your life a lot easier.</p> <p>Try this:</p> <pre><code>public char GenerateChar(Random rng) { // 'Z' + 1 because the range is exclusive return (char) (rng.Next('A', 'Z' + 1)); } public string GenerateString(Random rng, int length) { char[] letters = new char[length]; for (int i = 0; i &lt; length; i++) { letters[i] = GenerateChar(rng); } return new string(letters); } private static readonly Random SingleRandom = new Random(); public string GenerateStringNotThreadSafe(int length) { return GenerateString(SingleRandom, length); } </code></pre> <p>Now it's worth being aware that <code>Random</code> isn't thread-safe, so if you've got multiple threads you shouldn't just have a single instance of <code>Random</code> in a static variable without locking. There are various ways around this - either create a subclass of <code>Random</code> which <em>is</em> thread-safe, or a set of static methods which do the same thing, or use thread-local variables to have one instance per thread.</p> <p>I have a <a href="http://www.yoda.arachsys.com/csharp/miscutil/usage/staticrandom.html" rel="noreferrer"><code>StaticRandom</code> class</a> as part of <a href="http://pobox.com/~skeet/csharp/miscutil" rel="noreferrer">MiscUtil</a> but these days I'm leaning towards the thread-local version and passing it down the chain where appropriate. One day I'll add that as another option to MiscUtil...</p>
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