RichTextBox C# поиск

[mike_ua]

Доброго времени суток! Нужно осуществить поиск введенного в TextBox слова по ранее загруженому тексту из *.rtf в RichTexBox. У кого какие есть предложения.

[Hollander]

/// <summary>
/// method for searching for specified text in a RichTextBox
/// </summary>
/// <param name="text">text we're looking for</param>
/// <param name="matchCase">match case or not?</param>
/// <param name="rtb">RichTextBox we're searching for</param>
public static void Find(string text, bool matchCase, System.Windows.Forms.RichTextBox rtb)
{
    try
    {
        //variable to hold the start position (start of the found text)
        int startPos;

        //what kind of search are we doing
        StringComparison type;

        //determine if it's a match case search or not
        type = matchCase == true ? StringComparison.Ordinal : StringComparison.OrdinalIgnoreCase;

        //look for the search text
        startPos = rtb.Text.IndexOf(text, type);

        //check the position
        if (!(startPos > 0))
        {
            //text doesn't exist so let the user know
            MessageBox.Show("Search text: '" + text + "' could not be found", "Text Not Found", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            return;
        }
        else
        {
            //Yureka! Select the found text
            rtb.Select(startPos, text.Length);
            //scroll to the found text
            rtb.ScrollToCaret();
            //add focus so the highlighting shows up
            rtb.Focus();
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message, "Search Error");
    }
}