title: How to declare a jagged array with "9HM.A2"
body: <p>I need to make this: </p>
  
  <pre><code> string[][] anordinaryname = new string[][]
  {
      new string[] {""},
      new string[] {""},
      new string[] {""},
      new string[] {""},
  };
  </code></pre>
  
  <p>This:</p>
  
  <pre><code> string[][] 9HM.A2 = new string[][]
  {
      new string[] {""},
      new string[] {""},
      new string[] {""},
      new string[] {""},
  };
  </code></pre>
  
  <p>i need it to be formatted exactly like this, but the 9 at the start and the . in the middle are causing issues. any fix?</p>
  
  <p>The reasoning for this as i am making a timetable organisation for my school. this is a period, so i need the user to put into an input field "9HM.A2", and then go to this array to get information, as this is how it is shown on the timetables we are given. It is for a school project.</p>