Dynamic change of metatags in MasterPage-inherited .aspx page

Posted by Ahmad Barirani in Web Development      No comments

May
7

To change a page’s metatags in codebehind (dynamically), use of HtmlMeta class from System.Web.UI.HtmlControls namespace will do.

Here’s a snippet to change the page’s keywords metatag for example:

HtmlMeta keywords = new HtmlMeta();
keywords.Name = “keywords”;
keywords.Content = “montreal, cinema, hockey, tourism”;
Page.Header.Controls.Add(keywords);

Only, if we apply this code to change metatags in a page that inherits from a MasterPage which has those metatags, then we will find ourselves in an ambiguous situation of having duplicate metatags (duplicate keywords metatag for example).

To avoid this situation, the MasterPage’s metatag must first be removed from the Page.Header.Controls collection.