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Session 1

Session 1. Introduction to. Web Applications and ASP.NET. Session Objectives. Describe the following -. Web application Web application development cycle. Explain Active Server Pages. Explain the features of ASP.NET. Client/Server and Web Applications. Permanent Connection.

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Session 1

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  1. Session 1 Introduction to Web Applications and ASP.NET Building Applications using ASP.NET and C# / Session 1 / 1 of 21

  2. Session Objectives • Describe the following - • Web application • Web application development cycle • Explain Active Server Pages • Explain the features of ASP.NET Building Applications using ASP.NET and C# / Session 1 / 2 of 21

  3. Client/Server and Web Applications Permanent Connection Client-Server Application Client 1 Server Permanent Connection Client 2 HTTP Request Client 1 (Browser) ActiveX Data Objects (ADO) HTTP Response IIS Database Client 2 (Browser) Web Application Building Applications using ASP.NET and C# / Session 1 / 3 of 21

  4. Web-enabled Application Architecture Internet Proxy Server Client 1 (Browser) Web server HTTP Certificate Server Database Server Other servers FTP SMTP Exchange Server Server-based programs ASP CGI ISAPI Building Applications using ASP.NET and C# / Session 1 / 4 of 21

  5. HTTP at work Page Request Client (Browser) SERVER Send me “Introduction to Hypertext” Client (Browser) SERVER Introduction to Hypertext Building Applications using ASP.NET and C# / Session 1 / 5 of 21

  6. Network Interface and HTTP Service Internet Network Interface Transport Layer and Internet Layer (TCP / IP) Windows Sockets HTTP FTP Building Applications using ASP.NET and C# / Session 1 / 6 of 21

  7. Accessing Database Information Internet Client (Browser) Web server HTTP Database Server ODBC Building Applications using ASP.NET and C# / Session 1 / 7 of 21

  8. Web Application Development Cycle • Planning the Web application • Designing the application • Constructing and testing the components of the application • Going live • Production and Maintenance Building Applications using ASP.NET and C# / Session 1 / 8 of 21

  9. Web Application Development Process Idea A Planning Phase Functional Specifications complete? Construction and Testing No Yes Complete? Design Phase No Yes Design complete? Going Live No Yes Production and Maintenance A Building Applications using ASP.NET and C# / Session 1 / 9 of 21

  10. Scripting Web client: Browser Data entry Web Server: CGI Scripts Processing Server-based processing Web client: Browser JavaScript VBScript Web Server: CGI Scripts Data entry Processing Processing Client-side processing Building Applications using ASP.NET and C# / Session 1 / 10 of 21

  11. Validating Data HTML Form User input JavaScript data validation Data valid? No Yes Submit data to server Valid Data Building Applications using ASP.NET and C# / Session 1 / 11 of 21

  12. Client-Side Scripting Validate data Provide user interaction Dynamically change content Integration Specifies the scripting language <script language="JavaScript"> <!-- JavaScript statements; //--> </script> comment tags Building Applications using ASP.NET and C# / Session 1 / 12 of 21

  13. Active Server Pages <HTML><BODY> <CENTER><I><FONT COLOR="HOTPINK" size = 5> <%If Time >= #12:00:00 AM# And Time < #12:00:00 PM# Then%> "Now the time is between 12:00 am and 12:00 pm" <%Else%>" Now the time is between 12:00 pm and 12:00 am" <%End If%> </FONT></I></CENTER> </BODY></HTML> Executed on server Output Building Applications using ASP.NET and C# / Session 1 / 13 of 21

  14. Processing of ASP file HTTP Request Client (Browser) IIS HTTP Response ASP.DLL ActiveX Data Objects (ADO) VBScript IIS JavaScript Database ASP file Building Applications using ASP.NET and C# / Session 1 / 14 of 21

  15. Advantages of ASP Automatic compilation Web page with dynamic content ASCII text to a client browser Pros Inaccessible source code Building Applications using ASP.NET and C# / Session 1 / 15 of 21

  16. ASP file in a Web-based application HTTP Request Client (Browser) IIS HTTP Response Active Server Components • Active Server Pages (ASP) • JavaScript • VBScript • Active Server Pages (ASP) • JavaScript • VBScript • Active Server Pages (ASP) • JavaScript • VBScript Database Building Applications using ASP.NET and C# / Session 1 / 16 of 21

  17. Evolution of ASP.NET Denali First beta version of ASP ASP 1.0 Available as an add-on to IIS 3.0 ASP 2.0 Came as a part of windows NT 4.0 ASP 3.0 Came along with Windows 2000 ASP.NET Comes along with the .NET framework Building Applications using ASP.NET and C# / Session 1 / 17 of 21

  18. Drawbacks of ASP Only two non-typed languages VBScript and JavaScript Interpreted ASP pages Spaghetti-like mixture of code, HTML and text Using the same file. DRAWBACKS Extra code for functionality No Re-usage of code No debugging mechanism Shut down of web server to install a new version of a DLL Building Applications using ASP.NET and C# / Session 1 / 18 of 21

  19. Advantages of ASP.NET ASP.NET • Supports strongly typed languages like C#, VB • Compiled pages improving execution speed • An inbuilt method Trace, helps in debugging a page • Supports re-use of code by the mechanism of inheritance • Provides server controls that are declarative • ASP code is separated from the HTML design and text • No need to register component. Building Applications using ASP.NET and C# / Session 1 / 19 of 21

  20. Features of ASP.NET - 1 • Recognizes the type of client browser and accordingly display the contents to the client. • Adds functionality using C# or VB.NET ASP.NET • Uses server - side caching • Ships with many built-in server controls Building Applications using ASP.NET and C# / Session 1 / 20 of 21

  21. Features of ASP.NET - 2 • Refers hierarchical namespaces. • Global.asax file holds additional events ASP.NET • Web service - a function deployed and used over the web Building Applications using ASP.NET and C# / Session 1 / 21 of 21

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