This article demonstrates how to dynamically include HTML
and client-side scripts in .aspx pages.
Because ASP.NET applications
are compiled and run before they are sent to the client, you cannot use a
variable in place of a file name in a server-side include file (such as <!--
-->"). However, you can use the Response
object to write the include file to the HTTP content
This article demonstrates how to create an .aspx page that
reads a file with static HTML and/or client-side script code and writes the
file's content to the browser.
In ASP.NET, the Response
object provides a new method named WriteFile
. You can use the WriteFile
method to write the specified file directly to an HTTP content
If you only want to write the content of a file to the
browser, you can accomplish this in just one statement. If you want to
manipulate the file before you send it to the browser, refer to the
section for information
about basic file input/output in .NET.
In ASP.NET, you can either
write inline code or write code in the code-behind module. This article
presents an inline code sample that opens a file and writes the file's content
to the browser.
Steps to Create the Sample
- Open Microsoft Visual Studio .NET.
- From the File menu, point to New, and then click Project.
- In the New Project dialog box, click Visual Basic Projects under Project Types. Under Templates, click ASP.NET Web Application.
- Switch to the HTML code editor for the .aspx page that is
created by default. Replace the existing code with the following code:
<%@ Page Language="vb" AutoEventWireup="false"%>
- Replace "Yourfile.inc" in the Response.WriteFile statement with the name of an include file that contains some
HTML or client-side script.
- Add "Yourfile.inc" to the project.
- Browse to the .aspx file. Note that the content of your
file is written to the browser.
- Server-side code in the dynamically included file is
displayed on the client browser.
The dynamically included file may
contains any server-side code, the server-side code is sent to the client
browser as plain text and is visible if you view the source of the page that is
displayed in the browser. Note that ASP.NET does not process server-side script in the dynamically included file. This
is because all of the ASP.NET code has already run before it includes the file;
thus, the server does not return to read anything for server-side processing
- If you use Response.Write or Response.WriteFile statements in a code-behind module, these statements write the
information before any HTML tags. The same behavior occurs if you use inline
<SCRIPT> tags with the RUNAT="Server" attribute.
code-behind modules are compiled first, all of the output that is generated by Response.Write, Response.WriteFile, or inline server-side <SCRIPT> tags appears before any
HTML tags when the HTML output is sent to the browser. This problem does not
occur when you use Response.Write statements in classic ASP-style tags.
For additional information, click the article numbers
below to view the articles in the Microsoft Knowledge Base:
How To Do Basic File I/O in Visual Basic .NET
How To Do Basic File I/O in Visual C# .NET
Article ID: 306575 - Last Review: June 29, 2004 - Revision: 3.4
- Microsoft ASP.NET 1.0
- Microsoft Visual Basic .NET 2002 Standard Edition
- Microsoft ASP.NET 1.1
- Microsoft Visual Basic .NET 2003 Standard Edition