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Understanding ASP.NET Technology for Web Development

Learn about ASP.NET, a server-side technology for dynamic web applications using .NET Framework. Explore terminology, structure of ASP.NET pages, directives, code blocks, server controls, and more.

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Understanding ASP.NET Technology for Web Development

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  1. ASP .NET – Active Server Pages

  2. ASP.NET is a server-side technology for developing web applications based on the .NET Framework.

  3. Terminology Reminder: web application – same as dynamic website.

  4. ASP.NET has been created in response to such technologies as CGI, PHP, etc., that allow creating dynamic webpages • ASP.NET allows use of multiple languages (C#, VB, others) • ASP.NET pages are compiled, not interpreted

  5. Essentially, ASP.NET requires using: • Windows, although .NET Framework has been ported to other operating systems, as well • Microsoft’s Internet Information Services (IIS) server (although a small server named Cassini exists for hobbyists)

  6. Microsoft SQL Server is also • required, if one needs a webpage to • interact with a database (required • in any serious web development)

  7. Technical details: • web pages are text files with .aspx • extension • web files should be placed in the • directory C:\Inetpub\wwwroot • files cannot be opened locally from • Explorer, only via the web server • default.aspx is a default page

  8. Structure of an ASP.NET page: • directives • code declaration blocks • code render blocks • ASP.NET server controls • server side comments • literal text and HTML tags.

  9. Role of the directives: • control how the page is compiled • allow importing classes • specify page caching in a browser • assist in debugging. • Directives start with <%@ and end with %> Example of a directive: • <%@ Page Language=“C#” %>

  10. Code declaration blocks help separate the application logic from HTML contents. The application logic defines variables, subroutines, functions, etc.

  11. Example of a code declaration block: <script runat=”server”> void mySub() { // Code placed here } </script>

  12. Code render blocks define inline code and inline expressions. Inline code render blocks execute one or more statements and are placed inside HTML code delimited by <% … %> Inline expression render blocks display values of variables/methods.

  13. Example of a code render block: <% string Title=”text”; %> Example of inline expression render block: <%= Title %>

  14. ASP.NET server controls • are central to every ASP.NET page • represent page’s dynamic elements • usually must reside within a • <form runat=“server”> tag • fall into 3 categories: ASP.NET • controls, HTML controls, and web • user controls.

  15. Server side comments allow including text, which will not be processed by ASP.NET. They are included in special type of brackets: <%-- comments go here --%>

  16. Literal text and HTML tags provide the structure for presenting dynamic data, give a page the right format, which the browser can understand.

  17. Sample code <%@ Page Language=”C#” %> <!DOCTYPE html PUBLIC ”-//W3C//DTD XHTML 1.0 Strict//EN” ”http://www.w3.org/TR/xtml1/DTD/html1-strict.dtd”> <HTML> <HEAD> <TITLE>Sample Page</TITLE> <SCRIPT runat=”server”> void Page_Load() { messageLabel.Text = ”Hello World”; } </SCRIPT> </HEAD> <BODY> <FORM runat=”server”> <P> <ASP:Label id=”messageLabel” runat=”server” /> <P> <%-- Declare title as string and set it --%> <% string Title=”From code render block”; %> <%= Tiltle %> </FORM> </BODY> </HTML>

  18. Summary All of the dynamic portions of the web pages in ASP.NET are usually contained within code render blocks or controls located inside a tag: <form runat=”server”>

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