/// <summary>
/// Fixes a plain text field for display as HTML by replacing carriage returns 
/// with the appropriate br and p tags for breaks.
/// </summary>
/// <param name="String Text">Input string</param>
/// <returns>Fixed up string</returns>
public static string DisplayMemo(string htmlText)
{
    if (htmlText == null)
        return string.Empty;
 
    htmlText = htmlText.Replace("\r\n", "\r");
    htmlText = htmlText.Replace("\n", "\r");
    //HtmlText = HtmlText.Replace("\r\r","<p>");
    htmlText = htmlText.Replace("\r", "<br />");
    return htmlText;
}
 
/// <summary>
/// Method that handles handles display of text by breaking text.
/// Unlike the non-encoded version it encodes any embedded HTML text
/// </summary>
/// <param name="text"></param>
/// <returns></returns>
public static string DisplayMemoEncoded(string text)
{
    if (text == null)
        return string.Empty;
 
    bool PreTag = false;
    if (text.IndexOf("<pre>") > -1)
    {
        text = text.Replace("<pre>", "__pre__");
        text = text.Replace("</pre>", "__/pre__");
        PreTag = true;
    }
 
 
    // fix up line breaks into <br><p>
    text = DisplayMemo(HtmlEncode(text)); //HttpUtility.HtmlEncode(Text));
 
    if (PreTag)
    {
        text = text.Replace("__pre__", "<pre>");
        text = text.Replace("__/pre__", "</pre>");
    }
 
    return text;
}
 
/// <summary>
/// HTML-encodes a string and returns the encoded string.
/// </summary>
/// <param name="text">The text string to encode. </param>
/// <returns>The HTML-encoded text.</returns>
public static string HtmlEncode(string text)
{
    if (text == null)
        return string.Empty;
 
    StringBuilder sb = new StringBuilder(text.Length);
 
    int len = text.Length;
    for (int i = 0; i < len; i++)
    {
        switch (text[i])
        {
 
            case '<':
                sb.Append("&lt;");
                break;
            case '>':
                sb.Append("&gt;");
                break;
            case '"':
                sb.Append("&quot;");
                break;
            case '&':
                sb.Append("&amp;");
                break;
            default:
                if (text[i] > 159)
                {
                    // decimal numeric entity
                    sb.Append("&#");
                    sb.Append(((int)text[i]).ToString(CultureInfo.InvariantCulture));
                    sb.Append(";");
                }
                else
                    sb.Append(text[i]);
                break;
        }
    }
    return sb.ToString();
}