title: Choosing random picturebox out of 20 of them c#
body: <p>I'm having a hard time with choosing a random <code>PictureBox</code>.</p>
  <p>I want to choose 2 random <code>PictureBox</code> and set the same image for both of them. The function should repeat 5 times.</p>
  <p>I've tried using an array, but I received an error that says that pictureBox1 can't be transformed into an array.</p>
  <pre><code>string[] array1 = new string[]
  {
      pictureBox1,
  };
  </code></pre>