ASP.NET Generic HTML5 Tag control for IE7 support

Html5Tag.cs

using System.Web.UI;
using System.Web.UI.WebControls;

public class Html5Tag : PlaceHolder
{
    public string TagName { get; set; }
    public string FallbackTagName { get; set; }
    public string CssClass { get; set; }

    public Html5Tag()
    {
        TagName = "div";
        FallbackTagName = "div";
    }

    protected override void Render(HtmlTextWriter output)
    {
        string classAndID = (string.IsNullOrWhiteSpace(CssClass) ? "" : " class=\"" + CssClass + "\"")
            + (string.IsNullOrEmpty(ClientID) ? "" : " id=\"" + ClientID + "\"");

        output.WriteLine("<!--[if lte IE 8 ]><" + FallbackTagName + classAndID + "><![endif]-->");
        output.WriteLine("<!--[if (gt IE 8)|!(IE)]><!--><" + TagName + classAndID + "><!--<![endif]-->");
        base.Render(output);
        output.WriteLine("<!--[if lte IE 8 ]></" + FallbackTagName + "><![endif]-->");
        output.WriteLine("<!--[if (gt IE 8)|!(IE)]><!--></" + TagName + "><!--<![endif]-->");
    }
}