title: How can I access winForm Common control inside helper class?
body: <p>I have windows form and want to use my below code inside my helper class. I made richtextbox and tabControl modifier public, but still I cant access the my richtextbox. It gives error at richTextBox1 saying </p>
  
  <p><code>The name richTextBox1 doesnt exist in the current context</code></p>
  
  <p>What I am doing wrong?</p>
  
  <p><em><strong>helper class</em></strong>  </p>
  
  <pre><code>List&lt;string&gt; commentLines = richTextBox1.Lines.ToList(); 
  </code></pre>