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HTML-encodes a string and returns the encoded string

using System.Globalization; using System.Linq; using System.Text; namespace jQueryBuddy.Utilities {     public static class StringExtensions     {         /// <summary>         /// HTML-encodes a string and returns the encoded string.         /// </summary>         /// <param name="html">The html string to encode. </param>         /// <returns>The HTML-encoded text.</returns>         public static string EncodeHtml(this string html)         {             if (html == null)                 return null;             var sb = new StringBuilder(html.Length);             var len = html.Length;             for (var i = 0; i < len; i++)             {                 switch (html[i])                 {                     case '<':                         sb.Append("&lt;");                         break;                     case '>':                         sb.Append("&gt;");                         break;                     case '"':                         sb.Append("&quot;");                         break;                     case '&':                         sb.Append("&amp;");                         break;                     default:                         if (html[i] > 159)                         {                             // decimal numeric entity                             sb.Append("&#");                             sb.Append(((int)html[i]).ToString(CultureInfo.InvariantCulture));                             sb.Append(";");                         }                         else                             sb.Append(html[i]);                         break;                 }             }             return sb.ToString();         }     } }