title: HashSet usable types?
body: <p>I know HashSet can use basic types like string and int, my question is what types are usable in HashSet. I am trying to create a HashSet of Cartesian coords that benefit from HashSet of not having duplicates. I tried </p>
  
  <pre><code>HashSet&lt;int[]&gt; temp = new HashSet&lt;int[]&gt;{new int[]{1,1}, new int[]{1,1} }
  </code></pre>
  
  <p>but that doesn't work. Looking for a type I can use to create a list of unique coords.</p>