title: How insert element in last list?
body: <p>I have a list <code>m</code>. I want to insert an element to the end of this <code>List</code>. Please tell me how I can do this.</p>
  
  <pre><code>public List&lt;double&gt; m = new List&lt;double&gt;();
  m[0].Add(1);
  m[1].Add(2);
  m[2].Add(3);
  </code></pre>
  
  <p>I want the following output if I add element 7 to the end:</p>
  
  <pre><code>1 2 3 7 
  </code></pre>