title: RichTextBox - highlight entire selected line
body: <p>So I can't find anything regarding what I'm asking, I have looked as much as I can and I can't find anything.</p>
  
  <p>What I'm developing is a Java IDE in C# and .NET, and I was wondering if I can get the RichTextBox to select and highlight the whole line when, for example, the user holds <code>Shift</code> and press down a bunch of times, it highlights the entire lines as you do it, in IDEs like Eclipse, Intellij, etc.</p>