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C# Insert block of code to every aspx page

I'm having a web application project which is running .NET 4.0. I've plenty of .aspx page and now I would like to add in a block of script code to all the .aspx page header, for example Google Analytics.
I know there is a solution to do is add in every single page, but I would like to know is there any other's way to do this instead modify every single .aspx page?
*My header is not runat server
I got an idea to do but not sure it's work or not.
Get the page class in Global.asax
Get the output stream from the page class.
Insert the Google Analytics code in the HTML header.
I couldn't get the Page.Response in the Global.asax as I tried in the Application_PostRequestHandlerExecute & also Application_EndRequest. Does anyone know is this work and how it's work?
Thanks.

Use master pages. This is the ASP.NET way of putting the same content on multiple pages without repeating yourself.

All of our aspx pages code-behind classes inherit from the same base class, which allows us to inject standard client side elements (controls, script, etc) into every page using a single point of control.
Our design was implemented before the advent of master pages, but while it could possibly be converted to a master-page design, we have found this implementation to be extremely flexible and responsive to changing needs.
For example, we have two completely separate application designs (different skin, some different behavior) that is based off of the same code base and page sets. We were able to dynamically swap out banners and other UI and script elements by simple modifications to the base class in order to support this without having to duplicate every page.
Unfortunately, if you want the script to be in the head element, you will need to ensure that they are all marked as runat=server.
Our base class itself inherits from Page, so it can intercept all of the page's events and act on them either instead of or in addition to the inheriting classes (we actually have internal overrideable methods that inheritors should use instead of the page events in order to ensure order of execution).
This is our (VB) code for adding script to the header (in the Page's LoadComplete method):
' sbscript is a stringbuilder that contains all of the javascript we want to place in the header
Me.Page.Header.Controls.Add(New LiteralControl(sbScript.ToString))
If it is not possible to change the heads to runat server, you could look into ClientScriptManager method RegisterClientScriptBlock which places the script at the top of the page.

You can create a basic page with the header with the custom code such as Google analytics and have the other pages inherit from that. It will facilitate two things:
1) In case you ever want to change the custom code you will only have to do it in one place
2) No repetitive code hence more maintainable

I am trying to do the same thing on a legacy app that we're trying to decommission. I need to display a popup on all the old pages to nag users to update their bookmarks to use the new sites, without forcing them to stop using the legacy site (yet). It is not worth the time to convert the site to run on a master page when I can just plop in a popup script, since this whole thing is getting retired soon. The main new site uses a master page, which obviously simplifies things there.
I have this line in a file that has some various constants in it.
Public Shared ReadOnly RetirementNagScript As String = "<Script Language='javascript'> alert('[app name] is being retired and will be shut down [in the near future]. Please update your bookmarks and references to the following URL: [some URL]'); </script>"
Then I am inserting it in Global.asax, in Application_PostAcquireRequestState:
Response.Write(Globals.RetirementNagScript)
Hopefully this is useful to you; I still need to be able to present a clickable URL to the user that way, on each page of the legacy site, and JS alert doesn't do that for me.

SharePoint open ribbon on page load

The problem I'm facing is getting the ribbon to open up automatically when I load a page, say I click on the 'Customer Info' link in the quick launch menu, I'd like the ribbon for the Customer Info page to appear upon loading the page.
We have some javascript that does this on custom pages with webparts, seen below:
<script type="text/javascript">
$(document).ready(function () {
WpClick({
srcElement: $(".s4-wpcell").get(0),
target: $(".s4-wpcell").get(0)
});
$(".item-select").click(function () {
RefreshCommandUI();
});
});
The pages I'm trying to do it on are just your run of the mill SharePoint pages with the 'add new item' link etc. Is there a way to do this through the schema file? Or is there some way to put the javascript code above into the schema file so it does this?
I'm open to suggestions.
Thanks!

I think you have a couple of options.
If you need the ribbon to always be open on page load within that site then put the javascript in your masterpage for that site (this may mean you need to create a custom masterpage deriving from the one you have now that includes this javascript)
If this is on a small number of pages (and the number isn't going to grow in the future) then I would recommend just putting the javascript in a content editor webpart. This can be hard to maintain if you expect this requirement for a lot of newly created pages on the site.
If you need to have the ribbon loaded for a number of page types look into creating custom page layouts for these page types (if you haven't already) and add the javascript to the page layouts you need it for. This may not be a good option if you are working with a bunch of pages that are already created using the out of the box templates as you would need to do some sort of migration to the new page layout.

Run a aspx page into a Sharepoint folder

I have a aspx page and I'd like to run it into a sharepoint folder. Is there a way to execute this page like a html page? What I really need is to run a c# code that is together the aspx page (code behind) to read a SQLite database and shows the result in a good interface (html-css-javascript).
Obs.: I have a assembly reference for the SQLite.
Thanks a lot!

You need to create an application page inside sharepoint and move your code in that application page. its very simple, please see this link.
http://www.c-sharpcorner.com/uploadfile/anavijai/how-to-create-custom-sharepoint-2010-application-page-using-visual-studio-2010/
Please note that application page only support web forms and not MVC

Not sure "run it into a sharepoint folder" means... You can't have page with code behind in regular SharePoint folders.
You can put ASPX pages (even with codebehind) in Layouts folder on server's disk and they will be avaiable with ....\layouts\your_page.aspx urls.

Add code behind to template in Umbraco

We're adding functionality to an Umbraco site. We do not have access to the c# of the templates and all we can do is create user controls and add them to the pages.
The original developers used the Umbraco UI to do the entire site so all we have access to is the template and its html but not the code behind.
What we now would like to do is add some code into one or two of the existing pages.
Can we do this? Can we add a class file that has a particular namespace etc that will then execute the page_load method when the template starts?
Sorry if I'm being a little vague

You can use masterpage the same way as you would use an aspx file, just create the template pages in the GUI and open the project in visual studio.
To create the codefile there is a utility that will do some of the work for you http://umbracocs.codeplex.com/

The template in Umbraco is really a master page. Umbraco has a single aspx page (default.aspx) that is the entry point for all requests. So you can't add code to a template in the sense you would add it into the code behind of a page.
Can't you just create a user control having the code that you need (no ui) and just add it to the tempate through a macro?

when do you need .ascx files and how would you use them?

When building a website, when would it be a good idea to use .ascx files? What exactly is the .ascx and what is it used for? Examples would help a lot thanks!

It's an extension for the User Controls you have in your project.
A user control is a kind of composite control that works much like an ASP.NET Web page—you can add existing Web server controls and markup to a user control, and define properties and methods for the control. You can then embed them in ASP.NET Web pages, where they act as a unit.
Simply, if you want to have some functionality that will be used on many pages in your project then you should create a User control or Composite control and use it in your pages. It just helps you to keep the same functionality and code in one place. And it makes it reusable.

We basically use user controls when we have to use similar functionality on different locations of an app. Like we use master pages for consistent look and feel of app, similarly to avoid repeating the same functionality and UI all over the app, we use usercontrols. There might me much more usage too, but I know this one only...
For example, let's say your site has 4 levels of users and for each user there are different pages under different directories with different access mechanisms. Say you are requesting address info for all users, then creating address fields like Street, City, State, Zip, etc on each page. That would be a repetitive job. Instead you can create it as an ascx file (ext for user control) and in this control put the necessary UI and business code for add/update/delete/select the address role wise and then simply reference it all required page.
So, thought user controls, one can avoid code repetition for each role and UI creation for each role.

Ascx-files are called User Controls and are meant for reusability and also for making complex aspx-pages less complex (lift out some part of the page). They could also be beneficial for something called donut caching, that is when you would like to cache a certain part of a page.

If you have a block of code+html that appears on several pages and is sort of independent of that page (say a block of latest news items), you could copy/paste the code to every page.
It is however better to put that code in its own block and just include that block on every page that needs it. That "block" is an ascx file.

One more use of .ascx files is, they can be used for Partial Page caching in ASP.NET pages. What we have to do is to create an ascx file and then move the controls or portion of the page we need to cache into that control. Then add the #OutputCache directive in the ascx control and it will be cached separately from the parent page. It is used when you don't want to cache the whole page but only a specific portion of the page.

ASCX files are server-side Web application framework designed for Web development to produce dynamic Web pages.They like DLL codes but you can use there's TAGS
You can write them once and use them in any places in your ASP pages.If you have a file named "Controll.ascx" then its code will named "Controll.ascx.cs".
You can embed it in a ASP page to use it:
<%# Control Language="C#" AutoEventWireup="true" CodeBehind="Controll.ascx.cs"%>

When you are building a basic asp.net website using webcontrols is a good idea when you want to be able to use your controls at more then one location in your website.
Separating code from the layout ascx files will be holding the controls that are used to display the layout, the cs files that belong to the ascx files will be holding the code that fills those controls.
For some basic understanding of usercontrols you can try this website