首先head标签上添加runat="server"。
protected void Page_Load(object sender, EventArgs e)
{
Page.Title = "标题";
//Description
HtmlMeta desc = new HtmlMeta();
desc.Name = "Description";
desc.Content = "描述";
Page.Header.Controls.Add(desc);
//Keyword
HtmlMeta keywords = new HtmlMeta();
keywords.Name = "keywords";
keywords.Content = "关键字";
Page.Header.Controls.Add(keywords); //js
HtmlGenericControl autoCompleteScript = new HtmlGenericControl("script");
autoCompleteScript.Attributes.Add("type", "text/javascript");
autoCompleteScript.Attributes.Add("src", "/js/autocomplete/jquery.autocomplete.js");
Page.Header.Controls.Add(autoCompleteScript); //css
HtmlLink autoCompleteCss = new HtmlLink();
autoCompleteCss.Href = "/js/autocomplete/jquery.autocomplete.css";
autoCompleteCss.Attributes.Add("rel", "stylesheet");
autoCompleteCss.Attributes.Add("type", "text/css");
Page.Header.Controls.Add(autoCompleteCss);
}