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Introduction

What is ASP.NET?

ASP.NET is a server side scripting technology that enables scripts

(embedded in web pages) to be executed by an Internet server.

ASP.NET is a Microsoft Technology

ASP stands for Active Server Pages

ASP.NET is a program that runs inside IIS

IIS (Internet Information Services) is Microsoft's Internet server

IIS comes as a free component with Windows servers

IIS is also a part of Windows 2000 and XP Professional

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What is an ASP.NET File?

An ASP.NET file is just the same as an HTML file

An ASP.NET file can contain HTML, XML, and scripts

Scripts in an ASP.NET file are executed on the server

An ASP.NET file has the file extension ".aspx

How Does ASP.NET Work?

When a browser requests an HTML file, the server returns the file

When a browser requests an ASP.NET file, IIS passes the request tothe ASP.NET engine on the server

The ASP.NET engine reads the file, line by line, and executes thescripts in the file

Finally, the ASP.NET file is returned to the browser as plain HTML

Introduction

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The Microsoft .NET Framework

The .NET Framework is the infrastructure for the Microsoft .NET

platform.

The .NET Framework is an environment for building, deploying, and

running Web applications and Web Services.

.NET Frameworks keywords:

Easier and quicker programming

Reduced amount of code

Declarative programming model

Richer server control hierarchy with events

Larger class library

Better support for development tools

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The .NET Framework consists of 3 main parts:

Programming languages:

C# (Pronounced C sharp)

Visual Basic (VB .NET)

J# (Pronounced J sharp)

Server technologies and client technologies:

ASP .NET (Active Server Pages)

Windows Forms (Windows desktop solutions)

Compact Framework (PDA / Mobile solutions)

Development environments:

Visual Studio .NET (VS .NET)

Visual Web Developer

The Microsoft .NET Framework

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Three Tier Architecture in ASP.NET

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Three Tier Architecture in ASP.NET

These layers are described below.

1. Application layer or Business layer2. Business layer

a. Property layer(Sub layer of business layer)

3. data layer

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Application layer is the form where we design using the controls like

textbox, labels, command buttons etc.

Business layer is the class where we write the functions which getthe data from the application layer and passes through the dataaccess layer.

Data layer is also the class which gets the data from the businesslayer and sends it to the database or gets the data from thedatabase and sends it to the business layer.

Property layer is the sub layer of the business layer in which wemake the properties to sent or get the values from the applicationlayer. These properties help to sustain the value in a object so thatwe can get these values till the object destroy.

Three Tier Architecture in ASP.NET

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ASP.NET Web Server Controls

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ASP.NET Web Server Controls

Standard Toolbox Controls

Data Toolbox Controls

Validation Toolbox Controls

Navigation Toolbox Controls

Login Toolbox Controls

WebParts Toolbox Controls

HTML Controls for ASP.NET Web Pages

Ajax Server Controls

Microsoft Ajax Extender Controls

http://msdn.microsoft.com/en-us/library/x8k61whf.aspxhttp://msdn.microsoft.com/en-us/library/s1c14y5c.aspxhttp://msdn.microsoft.com/en-us/library/ah5a961d.aspxhttp://msdn.microsoft.com/en-us/library/c4hb2k3a.aspxhttp://msdn.microsoft.com/en-us/library/tz6e5ezc.aspxhttp://msdn.microsoft.com/en-us/library/tz6e5ezc.aspxhttp://msdn.microsoft.com/en-us/library/t5d54cf8.aspxhttp://msdn.microsoft.com/en-us/library/bb386522.aspxhttp://msdn.microsoft.com/en-us/library/bb532368.aspxhttp://msdn.microsoft.com/en-us/library/bb532368.aspxhttp://msdn.microsoft.com/en-us/library/bb386522.aspxhttp://msdn.microsoft.com/en-us/library/t5d54cf8.aspxhttp://msdn.microsoft.com/en-us/library/tz6e5ezc.aspxhttp://msdn.microsoft.com/en-us/library/tz6e5ezc.aspxhttp://msdn.microsoft.com/en-us/library/tz6e5ezc.aspxhttp://msdn.microsoft.com/en-us/library/tz6e5ezc.aspxhttp://msdn.microsoft.com/en-us/library/c4hb2k3a.aspxhttp://msdn.microsoft.com/en-us/library/ah5a961d.aspxhttp://msdn.microsoft.com/en-us/library/s1c14y5c.aspxhttp://msdn.microsoft.com/en-us/library/x8k61whf.aspx

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Asp.net Page life Cycle

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Asp.net Page life Cycle

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Life-Cycle Events PreInit :-

Raised after the start stage is complete and before the initialization stage

begins. Use this event for the following:

Check the IsPostBack property to determine whether this is the first time

the page is being processed. The IsCallback and IsCrossPagePostBack

properties have also been set at this time.

Create or re-create dynamic controls.

Set a master page dynamically.

Set the Theme property dynamically.

Read or set profile property values.

Init :-Raised after all controls have been initialized and any skin settings have

been applied. The Init event of individual controls occurs before the Init

event of the page.

Use this event to read or initialize control properties.

http://msdn.microsoft.com/en-us/library/system.web.ui.page.preinit.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.ispostback.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.iscallback.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.iscrosspagepostback.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.theme.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.init.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.init.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.init.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.init.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.init.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.init.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.init.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.init.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.theme.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.iscrosspagepostback.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.iscallback.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.ispostback.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.preinit.aspx

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General Page life-Cycle Stages

InitComplete :-

Raised at the end of the page's initialization stage. Only one

operation takes place between the Init and InitComplete events:

tracking of view state changes is turned on. View state tracking

enables controls to persist any values that are programmatically

added to the ViewState collection. Until view state tracking is

turned on, any values added to view state are lost across postbacks.Controls typically turn on view state tracking immediately after they

raise their Init event.

Use this event to make changes to view state that you want to

make sure are persisted after the next postback.

PreLoad :-

Raised after the page loads view state for itself and all controls, and

after it processes postback data that is included with the Request

instance.

http://msdn.microsoft.com/en-us/library/system.web.ui.page.initcomplete.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.init.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.initcomplete.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.viewstate.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.init.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.preload.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.preload.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.request.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.request.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.preload.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.preload.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.init.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.viewstate.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.initcomplete.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.init.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.initcomplete.aspx

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General Page life-Cycle Stages Load :-

The Page object calls the OnLoad method on the Page object, and

then recursively does the same for each child control until the pageand all controls are loaded. The Load event of individual controls

occurs after the Load event of the page.

Use the OnLoad event method to set properties in controls and to

establish database connections. Control events:-

Use these events to handle specific control events, such as a Button

control's Click event or a TextBox control's TextChanged event.

LoadComplete :- Raised at the end of the event-handling stage.

Use this event for tasks that require that all other controls on the

page be loaded.

http://msdn.microsoft.com/en-us/library/system.web.ui.control.load.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.onload.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.load.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.load.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.onload.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.button.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.button.click.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.textbox.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.mobilecontrols.textbox.textchanged.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.loadcomplete.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.loadcomplete.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.loadcomplete.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.loadcomplete.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.mobilecontrols.textbox.textchanged.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.textbox.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.button.click.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.button.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.onload.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.load.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.load.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.onload.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.load.aspx

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General Page life-Cycle Stages PreRender :-

Raised after the Page object has created all controls that are

required in order to render the page, including child controls ofcomposite controls. (To do this, the Page object calls

EnsureChildControls for each control and for the page.

The Page object raises the PreRender event on the Page object, and

then recursively does the same for each child control. ThePreRender event of individual controls occurs after the PreRender

event of the page.

Use the event to make final changes to the contents of the page or

its controls before the rendering stage begins.

PreRenderComplete:-

Raised after each data bound control whose DataSourceID property

is set calls its DataBind method.

http://msdn.microsoft.com/en-us/library/system.web.ui.control.prerender.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.ensurechildcontrols.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.prerender.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.prerender.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.prerender.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.prerendercomplete.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.prerendercomplete.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.databoundcontrol.datasourceid.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.databind.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.savestatecomplete.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.databind.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.databoundcontrol.datasourceid.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.prerendercomplete.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.prerendercomplete.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.prerender.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.prerender.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.prerender.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.ensurechildcontrols.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.prerender.aspx

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General Page life-Cycle Stages SaveStateComplete :-

Raised after view state and control state have been saved for the

page and for all controls. Any changes to the page or controls at thispoint affect rendering, but the changes will not be retrieved on the

next postback.

Render :-

This is not an event; instead, at this stage of processing, the Pageobject calls this method on each control. All ASP.NET Web server

controls have a Render method that writes out the control's

markup to send to the browser.

Unload :-

Raised for each control and then for the page.

In controls, use this event to do final cleanup for specific controls,

such as closing control-specific database connections.

http://msdn.microsoft.com/en-us/library/system.web.ui.page.savestatecomplete.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.savestatecomplete.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.savestatecomplete.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.render.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.render.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.render.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.unload.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.unload.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.unload.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.unload.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.render.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.render.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.control.render.aspxhttp://msdn.microsoft.com/en-us/library/system.web.ui.page.savestatecomplete.aspx

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The following figure illustrates how the server controls

on an ASP.NET page is processed by the server

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