停止代码构建器转义单引号ASP.NET MVC 2

我有以下HtmlHelper方法，我想创建一个使用JavaScript重定向的按钮：

public static String JavaScriptButton(this HtmlHelper Helper,String value,String action,String controller,object routeValues = null,object htmlAttributes = null)
{
    var a = (new UrlHelper(Helper.ViewContext.@R_197_10613@estContext))
                            .Action(action,controller,routeValues);

    var builder = new TagBuilder("input");
    builder.Attributes.Add("type","submit");
    builder.Attributes.Add("value",value);
    builder.Attributes.Add("class","button");
    builder.Attributes.Add("onclick",String.Format("javascript:LOCATIOn.href='{0}'",a));
    builder.MergeAttributes(new RouteValueDictionary(htmlAttributes));

    return MvcHtmlString.Create(builder.ToString(tagRenderMode.SelfClosing)).ToString();         
}

问题是创建onclick处理程序的行正在被tagbuilder转义，结果是html是：

<input class="button" onclick="javascript:LOCATIOn.href=&#39;&#39;" type="submit" value="Return to All Audits" />

有没有办法停止这种行为？

public class HtmlAttributeNoEncoding : System.Web.Util.httpEncoder
{
    protected override void HtmlAttributeEncode(String value,System.IO.TextWriter output)
    {
        output.Write(value);
    }
}

<httpRuntime encoderType="HtmlAttributeNoEncoding"/>