title: Drawing an absolute line in a window in C#
body: <p>I have an application on windows with multiline text field on it. I need a way to draw lines on that text field, so you could see both, the letters typed and those lines. I need to do this with C#, but I can use .dll's written in C++.</p>
  
  <p>I've heard something about subclassing where I could overtake render function from a window and adjust something to it, how do I do that with C#?</p>
  
  <p>Or maybe there are simplier ways than that? Please share.</p>