title: RichTextBox - Add text to top with multiple colors (only latest line is showing)
body: <p>I'm trying to replicate a log window, so the most recent log should appear at the top - most visible. Thus, I need to add a text to the top (no problem) but with multiple colors (problem).</p>
  
  <p>First I store the original text. (it's rtf or text - tried both)
  And then I add the new text, with a username and then a message. The username should be one color and the message another. It's always single lined too.</p>
  
  <p>All I get by my method is that when appending the old text or the old RTF text, the latest "log" only shows.</p>
  
  <pre><code>public void AddLog(Log log)
  {
          try
          {
              string oldText = this.richTextBox1.Rtf;
  
              this.richTextBox1.Text = log.User + ": " + log.Message + "\n";
              this.richTextBox1.Select(0, log.User.Length);
              this.richTextBox1.SelectionColor = Color.GreenYellow;
              this.richTextBox1.Select(log.User.Length + 2, log.Message.Length);
              this.richTextBox1.SelectionColor = Color.White;
              this.richTextBox1.DeselectAll();
              this.richTextBox1.Rtf += oldText;
  
          }
          catch { }
  }
  </code></pre>
  
  <p>Is this even possible? Because it doesn't save the old RTF text and the old RTF text can't be appended after the new text, which means I probably have to add newest text below which isn't what I want.</p>
  
  <p>If I instead of saving the "RTF" text, the format (colors) will disappear and will only show one color.</p>