ASP.NET masterpages: how to insert markup in the head section inside the aspx?

I know I can access the head section of a page which uses a masterpage programmatically this way (in code behind):

This is only an example (I'd like to insert scripts and styles etc.):

this.Header.Title = "I just set the page's title";

Is there a simple way to do this in a declarative way on in the aspx file itself?

Sometimes it would be handy to insert a client script or a style declaration or a link to an external resource.

You can do this by using content regions in the head, in exactly the same way as you would in the body of the page. eg, In your masterpage:

<head>
    <link type="text/css" rel="stylesheet" href="/styles/common1.css" />
    <script type="text/javascript" src="/scripts/common1.js"></script>
    <asp:contentplaceholder id="ExtraStylesAndScripts" runat="server" />
</head>

And then in the page itself just something like:

<asp:content contentplaceholderid="ExtraStylesAndScripts" runat="server">    
    <link type="text/css" rel="stylesheet" href="/styles/extra1.css" />
    <link type="text/css" rel="stylesheet" href="/styles/extra2.css" />
    <script type="text/javascript" src="/scripts/extra1.js"></script>
    <script type="text/javascript" src="/scripts/extra2.js"></script>
</asp:content>

For stylesheet you can use this :

HtmlLink cssRef = new HtmlLink();
cssRef.Href = "addins/main.css";
cssRef.Attributes["rel"] = "stylesheet";
cssRef.Attributes["type"] = "text/css";
Page.Header.Controls.Add(cssRef);

For Meta Tags :

HtmlMeta metaTag = new HtmlMeta();
metaTag.Name = "author";
metaTag.Content = "ScarletGarden";
Page.Header.Controls.Add(metaTag);

But there is no way to add external script files to header element.

You can add inside body element by :

if (!ClientScript.IsClientScriptIncludeRegistered("myExternalScript"))
{
   ClientScript.RegisterClientScriptInclude("myExternalScript", "js/myJSFile.js");
}

Hope this helps !

You can declare the page title in the content page declaration.

<%@ Title="Page Title" Page Language="C#" AutoEventWireup="true" CodeFile="Subpage.aspx.cs" Inherits="Subpage" MasterPageFile="~/MasterPage.master" %>

I haven't tried this.
But you can put HEAD element inside html with the enclosed string in asp style markup.

e.g. <%=myTitle%>

来源：https://stackoverflow.com/questions/568717/asp-net-masterpages-how-to-insert-markup-in-the-head-section-inside-the-aspx

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