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    <p>Your <code>arrayRow[]</code> and <code>arrayCol[]</code> will be just two lines of a two-dimensional array (if you didn't mean jagged one).</p> <p>So the code to unite two arrays into one is just:</p> <pre><code>public static T[,] Union&lt;T&gt;(T[] first, T[] second) //where T : struct { T[,] result = new T[2, Math.Max(first.Length, second.Length)]; int firstArrayLength = first.Length * Marshal.SizeOf(typeof(T)); Buffer.BlockCopy(first, 0, result, 0, firstArrayLength); Buffer.BlockCopy(second, 0, result, firstArrayLength, second.Length * Marshal.SizeOf(typeof(T))); return result; } </code></pre> <p>Which will produce this result: <a href="http://pasteboard.co/1eEsHzOi.png" rel="nofollow">image</a>.</p> <p>As <a href="http://social.msdn.microsoft.com/Forums/en-US/netfxbcl/thread/5d525b76-f5b6-4340-a899-c3c82570d2e1#4fd0199f-ca1a-40be-90b0-c5c31208e105" rel="nofollow">it have been mentinoned</a>, <code>BlockCopy</code> is cooler than <code>for</code> cycle.</p> <hr> <p>If you <strong>do</strong> mean that you need a jagged array (like <code>int[][]</code>), that the solutiona will be way more simplier:</p> <pre><code>public static T[][] UnionJagged&lt;T&gt;(T[] first, T[] second) { return new T[2][] { first, second }; } </code></pre> <p>Which transforms into even simplier if we add multiple-array-as-parameters functionality:</p> <pre><code>public static T[][] UnionJagged&lt;T&gt;(params T[][] arrays) { return arrays; } static void Main() { int[] a = new int[] { 10, 2, 3 }; int[] b = new int[] { -1, 2, -3 }; int[] c = new int[] { 1, -2, 3 }; int[][] jaggedThing = UnionJagged(a, b, c); } </code></pre>
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    1. CO+1, I agree with you, but I don't think OP is currently capable to experiment with all advanced techniques.
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