C# Array Merge Without Dupes
<p>Let's say I have these two arrays:</p>

<pre><code>string[] arr1 = new string[2]{"Hello", "Stack"}
string[] arr2 = new string[2]{"Stack", "Overflow"}
</code></pre>

<p>How would I merge them to get a third array like so: <code>string[3]{"Hello", "Stack", "Overflow"}</code>?</p>
