Asp.net 动态添加Meta标签

下面代码动态设置浏览器文档模式

HtmlHead head = (HtmlHead)Page.Header;
           HtmlMeta contentType = new HtmlMeta();//显示字符集的设定 设定页面使用的字符集
           contentType.HttpEquiv = "X-UA-Compatible";
           contentType.Content = "IE=Edge";
           head.Controls.AddAt(, contentType);