Introduction to asp.net
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The document provides an introduction to ASP.NET, including what ASP is, how ASP.NET builds on ASP, and the key benefits and components of ASP.NET. It discusses how ASP.NET web applications are executed via HTTP requests and responses, and how code is separated from presentation using code-behind files. It also summarizes the basic steps to create a simple ASP.NET application in Visual Studio.
Introduction to asp.net
- 2. What is ASP? • ASP stands for Active Server Pages • ASP is a Microsoft Technology • ASP is a program that runs inside a web server • An ASP file is just the same as an HTML file • An ASP file can contain server scripts in addition to HTML • Server scripts in an ASP file are executed on the server
- 3. <!DOCTYPE html> <html> <body> <% response.write("My first ASP script!") %> </body> </html>
- 4. • ASP.NET is an open-source server-side web application framework designed for web development to produce dynamic web pages. • It was developed by Microsoft to allow programmers to build dynamic web sites, web applications and web services. ASP.NET
- 5. ASP.NET Benefits • Separate Presentation from code • Object Oriented Approach • Event Driven Architecture • Code Compilation • Built in State Management • Many others (data binding, validation, master page etc…)
- 6. ASP.NET Execution • ASP.NET Applications are executed via sequence of HTTP Requests and HTTP Responses
- 7. • Client Browser request ASPX pages • The webserver executes the ASPX page and produce html + css + javascript Using ASP.NET • Simple Web Pages • Web Forms • MVC (model view controller) • SignalR
- 8. ASP.NET Working Traditional web pages • Consist of static html, images, styles etc. • Execute code on the client side • Simple operations ASP.NET Webforms • Execute code on the server side • Database access • Dynamic Pages • High Security level
- 9. Separate Presentation from code In traditional web development, HTML and programming code in one file • Hard to read, understand • Hard to test and debug ASP.NET Splits web pages into two parts: • .aspx file containing HTML • Code-behind file contain the presentation logic for the particular page
- 11. Steps to create simple ASP.NET Application 1.Start Visual Studio 2.Create “New website” 3.Add 2 text fields, 1 label, 1 button 4.Double click on the button 5.Add code to add numbers entered in text fields 6.Display the result in the label
- 12. ASP.NET Base Components • Web Forms – Deliver ASP.NET user interface • Web Control – the components the we can use in our web application (eg:textbox) • “Code-behind” – contains the server side code • Web.config – Contains ASP.NET application configuration • Machine.config – contains configurations for all applications in the server • Global.asax – class containing application level event handlers
- 13. ASP.NET Web Controls ASP.NET Web controls are the smallest component part Deliver fast and easy component-oriented development process HTML abstraction, but finally everything is HTML <form runat="server" ID="frmMain"> <asp:button runat="server" ID="btn" Text="Click me!" OnClick="btn_Click" /> </form>
- 14. Web.config Main settings and configuration file for ASP.NET Text based XML document Defines: Connection strings to any DB used by app The default language for child pages Whether debugging is allowed
- 15. Global.asax Also known as ASP.NET application file Located in the Web application root folder Exposes application and session level events Application_Start Application_End Session_Start Session_End etc…
- 16. ASP.NET Execution model • First call to a page
- 17. ASP.NET Execution model • Any other call after first
- 18. Coding Methods
- 19. Writing code in an ASP.NET Web form is done in three ways: Mixed code method Inline code method Code-behind method
- 20. Mixed Code Method The code is in the same file as the web content, mixed with the HTML code This method is not recommended as the source code is hard to read and maintain Inline Code Method The code is separated in a SCRIPT section in the same file Code-Behind Method A separate compiled file containing the program logic of the page Each web page has its own code-behind page Has the same name as the web page to which it is attached The file extension is .aspx.cs The two files are built into one when the application is started