/// <summary>
/// Converts the content form url virtual (relative) path to an application absolute path.
/// </summary>
/// <param name="helper">The url helper object.</param>
/// <param name="form">The form object.</param>
/// <param name="urlparams"></param>
/// <returns>A absolute url of content form.</returns>
public static string Content(this UrlHelper helper, ContentFormDecorator form, params object[] urlparams)
{
if (form == null)
throw new ArgumentNullException("form");
var url = form.Url(urlparams);
if (!string.IsNullOrEmpty(url))
return helper.Content(url);
return "javascript:void(0);";
}