static IHtmlSanitizer CreateSanitizer()
{
if(String.IsNullOrEmpty(ToolkitConfig.HtmlSanitizer))
return null;
var sanitizerType = Type.GetType(ToolkitConfig.HtmlSanitizer);
var sanitizer = Activator.CreateInstance(sanitizerType);
return (IHtmlSanitizer)sanitizer;
}