Adding Formatted Text to RichTextBox

RichTextBox provides the method AppendText() inherited from TextBoxBase to programmatically add  text to the editor control, but there seems to be no native method to append formatted text.

A small extension class adds this functionality:

public static class RichTextBoxExtensions
{
  const string NewLine = "\r\n";

  public static void AppendLine(this RichTextBox ed)
  {
    ed.AppendText(NewLine);
  }

  public static void AppendLine(this RichTextBox ed, string s)
  {
    ed.AppendText(s + NewLine);
  }

  public static void AppendBoldLine(this RichTextBox ed, string s)
  {
    int ss = ed.SelectionStart;
    ed.AppendText(s);
    int sl = ed.SelectionStart - ss + 1;

    Font bold = new Font(ed.Font, FontStyle.Bold);
    ed.Select(ss, sl);
    ed.SelectionFont = bold;
    ed.AppendText(NewLine);
  }
}

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