How to use multi color in richtextbox [duplicate]

Answer 1

I found this extension method that gives you the ability to change the color of the string as well as inserting a newline value:

    public static void AppendText(this RichTextBox box, string text, Color color, bool AddNewLine = false)
    {
        if (AddNewLine)
        {
            text += Environment.NewLine;
        }

        box.SelectionStart = box.TextLength;
        box.SelectionLength = 0;

        box.SelectionColor = color;
        box.AppendText(text);
        box.SelectionColor = box.ForeColor;
    }