Marking ASP.NET 2.0 Generated JavaScript as CDATA

The following code example is a workaround for marking ASP.NET generated JavaScript as CDATA, which is required when serving XHTML ASP.NET 2.0 pages as application/xhtml+xml (see Serving the Correct MIME Type for XHTML using ASP.NET 2.0).

Place the following code in your master page:

protected override void Render(HtmlTextWriter writer)
{
  StringWriter stwHtml = new StringWriter();
  base.Render(new HtmlTextWriter(stwHtml));
  String strHtml = stwHtml.ToString();
  // Enclose ASP.NET generated client ECMAScript / JavaScript in CDATA Wrapper
  Regex regScriptCDATA = new Regex("(<script\stype="text\/....script">(?:\s)*?)" + "(?:<!--\s)" + "((?:.|
)*?)" + "(?:// -->)" + "((?:\s)*?<\/script>)");
  String strScriptCDATA = "$1" + "<!--//--><![CDATA[//><!--
" + "$2" + "
//--><!]]>" + "$3";
  strHtml = regScriptCDATA.Replace(strHtml, strScriptCDATA);
  writer.Write(strHtml);
}

You may need to add the following at the beginning of your master page code:

using System.IO;
using System.Text.RegularExpressions;