怎么在后台修改前台html页面的key、title、description

public void UpdateMeta(string title, string keyword, string desc)
{

for (int i = this.Header.Controls.Count - 1; i >= 0; i--)
{
if (this.Header.Controls[i].GetType() == typeof(HtmlMeta))
{
HtmlMeta hmt = (HtmlMeta)this.Header.Controls[i];
if (hmt.Attributes["name"] != null)
this.Header.Controls.RemoveAt(i);
}
}
this.Page.Title = title;

HtmlMeta hm = new HtmlMeta();
hm.Name = "keywords";
hm.Content = keyword;
Header.Controls.AddAt(1, hm);

HtmlMeta hm1 = new HtmlMeta();
hm1.Name = "description";
hm1.Content = desc;
Header.Controls.AddAt(2, hm1);
}