In terms of efficiency and performance, which code is the best way to remove HTML tags in a string?

Option 1:

string ss = "<b><i>The tag is about to be removed</i></b>";
        Regex regex = new Regex("\<[^\>]*\>");
        Response.Write(String.Format("<b>Before:</b>{0}", ss)); // HTML Text
        Response.Write("<br/>");
        ss = regex.Replace(ss, String.Empty);
        Response.Write(String.Format("<b>After:</b>{0}", ss));// Plain Text as a OUTPUT

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Option 2:

using System;
using System.Text.RegularExpressions;

/// <summary>
/// Methods to remove HTML from strings.
/// </summary>
public static class HtmlRemoval
{
    /// <summary>
    /// Remove HTML from string with Regex.
    /// </summary>
    public static string StripTagsRegex(string source)
    {
    return Regex.Replace(source, "<.*?>", string.Empty);
    }

    /// <summary>
    /// Compiled regular expression for performance.
    /// </summary>
    static Regex _htmlRegex = new Regex("<.*?>", RegexOptions.Compiled);

    /// <summary>
    /// Remove HTML from string with compiled Regex.
    /// </summary>
    public static string StripTagsRegexCompiled(string source)
    {
    return _htmlRegex.Replace(source, string.Empty);
    }

    /// <summary>
    /// Remove HTML tags from string using char array.
    /// </summary>
    public static string StripTagsCharArray(string source)
    {
    char[] array = new char[source.Length];
    int arrayIndex = 0;
    bool inside = false;

    for (int i = 0; i < source.Length; i++)
    {
        char let = source[i];
        if (let == '<')
        {
        inside = true;
        continue;
        }
        if (let == '>')
        {
        inside = false;
        continue;
        }
        if (!inside)
        {
        array[arrayIndex] = let;
        arrayIndex++;
        }
    }
    return new string(array, 0, arrayIndex);
    }
}

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