title: make 2D array in C# and show in text box
body: <p>I want to display a matrix as shown below in a textbox, but I don't know where to start. How can I get this result in a textbox?</p>
  
  <pre><code> 5  5  5  5
   8  9  3  1
   7  9  2  7 
   3  7  8  6
   8  3  1  2
  </code></pre>