.Net

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Table of contents Introduction to VS 2005 Application and Page Frameworks GUI Controls Validation Server Controls

Working with Master Pages Themes & Skins Collections & Lists Data Binding Data Management with ADO.Net Working with XML Site Navigation Security State Management Caching Debugging & Error Handling File I/O & Streams Configurations Softsmith Infotech

Introduction to VS 2005

• Visual Studio 2005 is an IDE that is used to create ASPX pages (Web application) • Creation of web application also creates a set of files.

• Web application exists only in the location specified by IIS virtual folder.

• In a system, the web root folder is //localhost This is the virtual folder • The physical path for this virtual folder is \\inetpub\wwwroot Softsmith Infotech

What can you find in a VS

• We can see these windows when we open the Visual Studio – Property Window – Shows the properties of a control(Page or button or textbox) – Solution Explorer – Shows the files that a opened project has – Output Window – Shows the result of a compilation or execution of a program – Error List – Shows the compilation errors etc.

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IIS – Internet Information Services

• IIS is a web server that comes along with .Net

• We can configure IIS using “inetmgr” • In the Start Menu, choose Run and type inetmgr. We will get a window that lists the websites present in the system.

• For creating a virtual directory, right click on the default website and select New -> Virtual Directory. – Give the alias name – Give the physical path – Give the access permissions and click finish.

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ASP .Net

• Used to create web applications and web services that run under IIS • ASP.NET is a collection of .NET classes that collaborate to process an HTTP request and generate an HTTP response • Helps us in creating Dynamic Web pages – Dynamic web pages – Pages will be generated at the server based on the user’s request and then given back to the client (user) Softsmith Infotech

ASP .Net Framework

• ASP.NET is a managed server-side framework – For building applications based on HTTP, HTML, XML and SOAP – ASP.NET relies on IIS for an HTTP entry point • ASP.NET supports building HTML-based Web Applications – Based on ASP.NET pages, Web forms and server side controls • ASP.NET supports building Web Services – Based on Web service classes and WebMethods Softsmith Infotech

Life cycle of a web page

• Page_Init – This is called when page is initialized. We can declare some variables which need to be initialized before page is loaded • Page_Load – The server controls are loaded in the page .This event is called every time when page is loaded • Control_Event – This event is fired when control like button are clicked or changed • Page_Unload – This event occurs when a page is Unloaded from memory • Page_Dispose – This event occurs when a page is released from memory Softsmith Infotech

Life cycle of a web application

• The Life of web application begins when a user requests for a page through the browser (client) • When IIS receives request from client it calls ASP. NET worker process • The ASP.NET worker process loads the assembly • The executable creates an instance of web form • Generates the HTML page to respond to the request • Posts the response to browser and then it destroys the instance of the web form • Then browser receives the generated HTML Softsmith Infotech

Life cycle of a web application (Contd..)

• Client Performs tasks like button click • The page’s data is sent back to server • When server receives this page it creates new instance of web form • Processes the event occurred • Then again send back HTML and destroys the page • When user stops the web application for a period of time session ends Softsmith Infotech

ASP .Net Advantages

• Executable portion of a web application are compiled • Enriched tool support • Applications are based on CLR – Common Language Runtime • On the fly updates deployed without restarting server • Better session management • Integration with ADO.NET

• Built in features for caching • Create XML Web services • Browser-independent • Language-independent Softsmith Infotech

Application and Page Framework

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ASP .Net Applications

• Each application is based on IIS virtual directory • Each application is contained within a physical directory • Each application runs in its own isolated AppDomain • Namespace must for this application is System.Web

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ASP .Net Pages

• Code and Design are separated • Design file – ASPX file – Contains ASPX or HTML tags • Code file – called as code behind file • Has the programming logic • Programming language can be – C# – VB .Net

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ASP .Net Pages (Contd..)

– ASPX Page has • – C# file will have • btnSubmit_Click() { ... } • The code behind page is inherited from

System.Web.UI.Page

class • The .aspx file containing the user interface is inherited from code behind class Softsmith Infotech

Files in a Web application Project

• AssemblyInfo.cs

– All the information about assembly including version, company name etc • Default.aspx

– The visual description of a Web form. • Default.aspx.cs

– The code behind that responds to events on the Web form • Default.aspx.resx

– XML resources used by web form • Global.asax – The global events that occur in web applications • Web.config

– Configuration contents like authentication mode, error files etc.

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GUI Controls Softsmith Infotech

Server Control

System. Object System.Web.UI System.Web.UI.Control System.Web.UI.Web Controls System.Web.UI.HTMLControls Softsmith Infotech

Web Controls

System.Object

System.Web.UI.Control

WebControl ListBox CheckBoxList ...

ListControl ...

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Table Button TextBox

Postback event

• These events cause the web page to be sent back to the server for immediate processing • When page is posted back ,the Page_Init, Page _Load events are handled • The page is submitted back and renders a new version of itself back to the user Softsmith Infotech

Validation Controls

• ASP .Net provides 5 validation controls that are used to check the validity of data entered by the user in the server controls on the web page.

• Client side validation is also possible through a Jscript library WebUIValidation.js

– Required field validator – Regular expression validator – Compare validator – Range validator – Custom validator – Validation summary Softsmith Infotech

Required Field Validator

• To check whether a control contains data • Properties: – ControlToValidate – ErrorMessage – Text • Method: – Validate Softsmith Infotech

Regular Expression Validator

• To check whether the entered data matches a specific format • Properties – ControlToValidate – ValidationExpression – ErrorMessage • Method – Validate Softsmith Infotech

Compare Validator

• To compare values entered in two controls • Properties: – ControlToCompare – ControlToValidate – ErrorMessage – ValueToCompare • Method: – Validate Softsmith Infotech

Range Validator

• To compare whether the entered value is between two specified values • Properties: – ControlToValidate – ErrorMessage – Type – MaximumValue – MinimumValue • Method: – Validate Softsmith Infotech

Custom Validator

• To Check the validity of an entered item using a client-side script or a server-side code, or both • Properties: – ControlToValidate – ErrorMessage • Events: – ServerValidate • Method: – OnServerValidate – Validate Softsmith Infotech

Validation Summary

• To Display validation errors in a central location or display a general validation error description • Properties: – HeadText – ShowMessageBox – ShowSummary Softsmith Infotech

User Controls

• We can create our own controls in addition to HTML and Web controls • User controls offer you an easy way to partition and reuse common user interface (UI) functionality across your ASP.NET Web applications • User controls are not compiled until run time • You can simply drag and drop them on the page and start using them • To create a user control: – Add a new item ( select user control as a template) and give it a name – Heading.ascx

– The following description can be seen in HTML view

<%@Control Language="c#" AutoEventWireup="false" Codebehind="Heading.ascx.cs“>

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Using a User Control

• To use a user control, just drag the ascx file from the solution explorer and drop it on the design area of the aspx page • Or give like this in the html view of the aspx page –

In the head portion

– •

< %@Register TagPrefix="uc1" TagName="Heading" src="Heading.ascx"% > In the body portion

•

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Calendar Control

• • • The Calendar Web server control displays a traditional one-month calendar on your Web Forms pages Few properties: – SelectedDate – SelectedDates – BackColor Few methods: – AddDays() – AddMonths() – AddYears() – GetMonth() – GetYear() – GetDayOfWeek() – IsLeapYear() Softsmith Infotech

DateTime

• DateTime is a static class. Members can be accessed via DateTime.Now and so on.

• The DateTime value type represents dates and times with values ranging from 12:00:00 midnight, January 1, 0001 Common Era to 11:59:59 P.M., December 31, 9999 C.E.

• Few properties: – Today – Now – Date • Few Methods: – AddDays() – AddMonths() – Compare() – ToLongDateString() – ToShortDateString() Softsmith Infotech

DataGrid Control

• Full-featured list output • Default is to show all columns – Can specify a subset of columns to display • Provides templates – Standard – Custom • Provides paging • Provides data updates Softsmith Infotech

Repeater Control

• Provides simple output of list of items • Templates provide the visual form • It iterates over the bound data • Display format of data is managed • Does not support paging • Provides templates for separators • Does not provide data updates Softsmith Infotech

Standard templates for Repeater controls – HeaderTemplate • Rendered before all data bound rows – ItemTemplate • Rendered for each row in the data source – AlternatingItemTemplate • Rendered for every other row – SeparatorTemplate • Rendered between each row – FooterTemplate • Rendered after all data bound rows Softsmith Infotech

Binding data

• To bind embedded controls to the data source of the container control –

DataBinder.Eval()

method is used • Syntax –

<%#DataBinder.Eval(Container.DataItem,“D ataFieldname")%>

– Container represents the container for data items – DataFieldname represents the name of data item field Softsmith Infotech