You're probably already aware of the benefits of metatags, which provide metadata about an HTML document. Metatags aren't rendered in the browser, but search engines use them to categorize web pages.

To add metatags dynamically, ASP.NET provides a handy class called HtmlMeta, from the System.Web.UI.HtmlControls namespace. Here's some sample C# code that shows how to add a meta tag to an ASP.NET page:

protected void Page_Load(object sender, EventArgs e)
    {
        /* ... some other code .... */

        System.Web.UI.HtmlControls.HtmlMeta htmlMeta = 
            new System.Web.UI.HtmlControls.HtmlMeta();
        htmlMeta.Name = "keyword";
        htmlMeta.Content = "This is a keyword";
        Page.Header.Controls.Add(htmlMeta);

        /* ... some other code .... */        
    }

The preceding code creates an HtmlMeta object and sets its Name and Content properties, then adds the HtmlMeta object to the Page.Header.Controls collection. This instructs ASP.NET to place the HTML metatag in the HEAD block. Here's an example:

<!-- Head contents come before this... -->
<meta name="keyword" content="This is a keyword" />
</head>