title: TextBox filling in C#
body: <p>I have a TextBox in my application, that it is used for showing state of process. Something like this</p>
  
  <pre><code>for(...)
    textbox.text = "new line \r\n" + textbox.text
  </code></pre>
  
  <p>Problem is, when it is filling, so no text is visible, just white background. When process is done, then the all added text is visible. Is any option, how do solve this (I need to have text visible during whole process).</p>
  
  <p>Thanks much.</p>