Naresh Information Technologies

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1 Naresh Information Technologies

2 Server-side technology ASP.NET Web Forms & Web Services Windows Form: Windows User Interface ADO.NET: Data & XML.NET Framework Base Class Library Common Language Runtime

3 .NET Framework VB C++ C# JScript J# Common Language Specification ASP.NET Web Forms Web Services Mobile Forms ADO.NET and XML Base Class Library Windows Forms Common Language Runtime Visual Studio.NET Operating System

4 Prerequisites for Web Applications Web Applications & Desktop Applications Web Server with Web Applications Web Server Role, about IIS Web Browsers, Web Support Languages Scripting Client-Side & Server-Side Scripting State Management

5 WebForms & WinForms In.NET, GUI-based web applications are called WebForms vs. WinForms, which are GUI-based Windows desktop applications Example: a simple web-based Calculator

7 Web Forms Compiled Support for VB Language Built-In Designers Server-Side Controls Intelligent Forms

8 ASP.Net Execution Scenario

9 Runtime Compilation Parse ASPX Engine Generate Codebehind class Request Request ASPX File Instantiate Gen d Page Class Compile Response Response Page Class Instantiate, Process and Render

10 ASP.NET Pages: Part Declarative, Part Code Combines declarative tags (HTML, ASPX directives, server controls tags, and static text) with code in a single file or in separate files. Unlike ASP, good separation provided between code and tags single file separate files ( code-behind ) code <tags> <tags> code Form1.aspx Form1.aspx Form1.aspx.vb

12 ViewState & Postback HTTP is stateless and only designed to provide a single web page of data, but we need state! We have some caches we also have view state to simply our pages ViewState (Dehydrate, rehydrate) It s a hidden control in the page which holds the settings of all of the server controls when it was last submitted Without viewstate, everything refers to its default values set in HTML Viewstate automatically sets all of the properties of the server controls for us before the page_load Viewstate is sent with every round trip, only put in it what you really need What is Viewstate valuable? Classic ASP problem? Later, we may put things in the view state ourselves

13 Postback Postback is posting the form to the aspx file itself You can check to see if your page load is the result of a post back with IsPostBack This allows for you to manage other stateful elements or have memory between page visits Only Server Controls have a property allowing them to automatically post back if they are changed

14 Controls What is an HTML Control? An HTML tag Very lightweight, standard HTML, renders only as HTML State is not managed for you Able to be runat= server to provide some basic programmatic access What is a server control? A server-side Web UI component exposes properties, methods, events renders as HTML, XML, script, etc. processes posted data and user actions can represent HTML elements or higher-level abstractions Technically speaking implemented as a.net class derives from System.Web.UI.Control or System.Web.UI.WebControls.WebControl

ispostback condition to data bind 1 st values CreateChildControls() ensures controls are ready to

15 Page/Control Processing Init Load PreRender SaveViewState Render Dispose Each control instantiated, set to initial state, added to control tree User code runs, tests!ispostback condition to data bind 1 st values CreateChildControls() ensures controls are ready to render Controls save current state (if different than initial values) Each control renders itself to the Response Pages and all controls are disposed

Page/Control Processing Post Back (ADVANCED)

restored from ViewState values Posted data

16 Page/Control Processing Post Back (ADVANCED) Init LoadViewState Load Postback data Postback events PreRender SaveViewState Render Dispose Last state of the controls is restored from ViewState values Posted data (in the HTTP form) is passed to its associated control Events are fired for controls in tree order, except the event that caused the post. It s fired last.

17 Web Applications with ASP.NET MVC

18 Agenda ASP.NET Today What is MVC? What is ASP.NET MVC? Demo

19 ASP.NET Today ASPX Page Master Page User/Custom/Server Controls User/Custom/Server Controls Model Data

20 Page Controller (WebForms) Request Default.aspx ASP.NET Init Load Postback events PreRender Unload Response Default.aspx (Run the page lifecycle)

21 What is MVC? Architectural/presentation design pattern Separates model from presentation Adds specific responsibility to portions of your UI Model View Controller

22 What is ASP.NET MVC? New web application framework ASP.NET implementation of MVC Makes unit testing web applications simpler Replaceable pipeline components Enables logical mapping of URLs to controllers

23 Front Controller (MVC) Request Customers /Edit/34 ASP.NET Customers Controller Edit Action Response Edit View Model

24 ASP.NET MVC App Execution Request 3 UrlRoutingModule MvcRouteHandler 4 1 URL Controller Handler Global.asax Application_Start /Customers/Edit/3 Customers MvcRouteHandler 2 Routing Table 5 Controller 6 Model 7 8 Response View

25 Example For example, consider the following URL: /Job/Details/3 This URL is parsed into three parts like this: Controller = JobController Action = Details & Id = 3 The default route includes default values for all three segments. The default Controller is HomeController, the default Action is Index, and the default Id is an empty string.

26 MVC - Controller A controller is responsible for controlling the way that a user interacts with an MVC application. A controller determines what response to send back to a user when a user makes a browser request.

27 MVC - View A view contains the HTML markup and content that is sent to the browser. A view is the equivalent of a page when working with an ASP.NET MVC application We must create views in the right location. The HomeController.Index() action returns a view located at the following path: \Views\Home\Index.aspx The HomeController.About() action returns a view located at the following path: \Views\Home\About.aspx

28 MVC - Model An MVC model contains all of your application logic that is not contained in a view or a controller The model will contain all of our application business logic and database access logic and other logics DataLayer kind of classes, Types for data should be created in MVC model.

29 How Does ASP.NET MVC Differ From ASP.NET WebForms? No postbacks No view state/control state No server-side form No page/control lifecycle What Do They Have In Common? Visual Studio web designer Master pages Membership/Roles/Profile providers Caching Other non ui services of asp.net

30 Questions

Naresh Information Technologies

Naresh Information Technologies Server-side technology ASP.NET Web Forms & Web Services Windows Form: Windows User Interface ADO.NET: Data & XML.NET Framework Base Class Library Common Language Runtime