Tutorial ASP 014

7/29/2019 Tutorial ASP 014

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ASP.NET

Module Subtitle


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Objectives

Introduction to ASP.NET

Concepts and Architecture

ASP.NET Features

Advanced ASP.NET

ASP.NET and the Microsoft .NET Framework


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Contents

Section 1: Overview

Section 2: Architecture

Microsoft .NET Framework and ASP.NET Configuration

Section 3: ASP.NET Features State Management, Security, and Event Model

Section 4: Advanced ASP.NET

Web Forms and Web Services

Working with Data

ASP to ASP.NET Migration

Appendix: Exploring Duwamish Online


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Section 1: Overview

Looking Back ...

ASP.NET Core Concepts


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Looking Back: Active Server Pages

What is ASP? Server-side scripting technology

Files containing HTML and scripting code

Access via HTTP requests

Scripting code is interpreted on server side

What can I do with ASP?

Easily and quickly create simple Web applications

Generate dynamic Web content Client-side scripting for validation

Access COM components to extend functionality

Databases


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Whats Wrong with That?

Mixes layout (HTML) and logic (scripting code)

Interpreting ASP code leads to performance loss

Uses scripting languages that are not strongly typed

Microsoft JScript

Microsoft Visual Basic Scripting Edition (VBScript)

Browser compatibility

No real state management No state sharing across Web farms

State is lost when IIS fails

Update files only when server is down


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Web development platform

New programming model

Web Client

Operating System

ASP.NET

ApplicationsIIS

.NETFramework


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Separate layout and business logic

Use services provided by the .NET Framework

Code is compiled the first time a page is requested

State management

Make use of programming languages

Cross-language integration

Update files while the server is running!


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Section 2: Architecture

The .NET Framework Architecture

Web Application Model

Configuration

Class Hierarchy


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The .NET Framework Architecture

Microsoft .NET Framework

System Services

Common Language Runtime

ASP.NET

Web Forms Web ServicesWindows Forms

Services Framework

Base Data Debug ...


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Web Application Model

Unmanaged Code

Managed Code

...Request Handler

HTTP Module

HTTP Module

HTTP Runtime

Host (IIS, Internet Explorer)

HTTP Request


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HTTP Runtime

Managed code Runs within an unmanaged host process

Aims for 100% availability

Asynchronously processes all requests

Multithreaded

Replaces ISAPI

Internet Server Application Programming Interface


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HTTP Module Pipeline

HTTP module pipeline Managed classes

Each module implements a specific interface

For example: state management or security

All requests are routed through the same pipeline

Add modules through Web.Config

Request handler

Managed classes Multiple request handlers for one application

But only one per URL


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Hierarchical Configuration

Configuration file: Web.Config

XML-based, human readable and writeable

File is kept within the application directory

Changes are automatically detected

Influence on the actual dir and all subs But:

Lock settings with attribute: allowOverride=false

RootDir

Sub

Dir1Sub

Dir2

Web.Config


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Web.Config sample


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Custom Configuration

Default machine.config (!) file is placed in %windir%\Microsoft.NET\Framework\\CONFIG

Standard set of configuration section handlers

Browser capabilities, custom error messages, and so on

Customized configuration

Extend the set of section handlers with your own

Implement the interface:

System.Configuration.IConfigurationSectionHandler

Problems with

Virtual directories and non-ASP.NET files


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Class Hierarchy 1/2

Namespaces Hierarchically structured

Dot-syntax, grouping classes logically

Abstract base classes and class implementations

You are free to implement your own

Sample: System.Web.UI.WebControls.Buttonnamespace class name

How to use namespaces: using MyAlias = System.Web.UI.WebControls


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Class Hierarchy 2/2

System.Web.UI.

WebControlsListControl

ListBox

CheckBoxList

Button

Table

WebControl

System.Web.UI.Control

System.Object

TextBox

......


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Section 3: Features

ASP.NET Syntax and Supported Languages Samples

Execution Process

Assemblies

State Management, Security, and Event Handling


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Business Logic and Layout

No more blending of HTML and scripting code Easy maintainability of your application

Completely separate layout and processing logic

No implementation code within HTML files Files for designers and files for programmers

You can still mix HTML and scripting code if you wish

.aspx.aspx.cs

.cs


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Supported Languages

Visual Basic VBScript is unmanaged !

JScript

C# New component-based language

C++

Managed Extensions for C++

Others: Cobol, Smalltalk, ...

Common Language Specification (CLS)


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C# Overview

New component-oriented language from Microsoft

Evolution of C and C++

Introduces improvement in areas such as

Type safety, versioning, events and garbage collection

Provides access to APIs like .NET, COM, or Automation Hello World sample

using System;namespace hwsample{public class Hello {public static void Main() {Console.WriteLine(Hello World!);}}}


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QuickStart

Different files with different file name extensions Standard ASP.NET files: .aspxor.ascx

Web Services: .asmx

Code (behind) files: .aspx.cs, .asmx.vb, ...

Configuration: Web.Config

Web applications: Global.asax and Global.asax.vb

All of them are text files

The easiest way to start

Change the .asp extension to .aspx


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Page Syntax1/3

Directives

Code Declaration Blocks

[ lines of code ]

Code Render Blocks

HTML Control Syntax


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Page Syntax2/3

Custom Control Syntax Custom server controls

Server control property

Subproperty

Server control event binding


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Page Syntax3/3

Data Binding Expression

Server-side Object Tags

Server-side Include Directives

Server-side Comments


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ASP.NET Sample1/2Sub SubmitBtn_Click(Sender As Object, E As EventArgs)Message.Text = Hi & Name.TextEnd Sub Name:


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ASP.NET Sample2/2


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Code

behind

.aspx Execution Cycle

IIS

ASP.NET Runtime

Instantiate controls

Parse .aspx file

Generate page class

Request .aspx file

Response

Client Server


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Execution process

Compilation, when page is requested the first time

Microsoft intermediate language (MSIL)

Assembly languagelike style

CPU independent

Provides a hardware abstraction layer

MSIL is executed by the common language runtime

Common language runtime

Just-in-time (JIT) compiler

Managed code


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Assemblies

Result of compiling is still a .dll or .exe file Multiple- or single-file assembly

Assembly 1

MyApp.dll

pic1.jpg

metadata

Assembly 2

MyApp.dll

metadatasharedname


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Metadata

An assemblys manifestA manifest contains

List of all assembly files

Information about versioning, shared name

and more ...

The information is used to

Locate and load class types

Lay out object instances in memory

Resolve method invocations and field references

Translate MSIL to native code

Enforce security


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State Management1/2

Application State What is an application?

Files, pages, modules, and executable code

One virtual directory and its subdirectories

Application state variables Global information

Implementation rules

Use of system resources

Lock and unlock your global information

Beware of global variables in multithreaded environments

Loss of state when host is destroyed

No state sharing across Web farms


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State Management2/2

Session State What is a session?

Restricted to a logical application

Context in which a user communicates with a server

Functionality

Request identification and classification

Store data across multiple requests

Session events

Release of session data

.NET State Server Process


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Security 1/3

Reasons for Security Prevent access to areas of your Web server

Record and store secure relevant user data

Security Configuration in Web.Config

, , , ...

Authentication, Authorization, Impersonation

Code Access Security

Are you the code you told me you are?

Protect your server from bad code


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Security 2/3

Authentication Validates user credentials

Awards an authenticated identity

Types of authentication

Windows, integrating with IIS 5.0

Passport, centralized services provided by Microsoft

Forms, request attachment

Authorization

Determine whether request is permitted

File and URL authorization


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Security 3/3

Impersonation IIS authenticates the user

A token is passed to the ASP.NET application

ASP.NET impersonates the given token

Access is permitted according to NTFS settings

Code Access Security

.NET Framework feature

Verify the codes identity and where it comes from Specify operations the code is allowed to perform


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Event Model 1/2

Application-level Event Handling Web Forms

Delegate Model

Connect event sender and event receiver

Single and multicast delegates

Event Delegates Are Multicast

Event Wiring

Register event handler with event sender


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Event Model 2/2

Events raised on client, but handled on server

ServerWeb Client

parse messageevent

event handler

event

message

response

call appropriate

event handler


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Event Samples

Event samples

System.Web.UI.WebControlsClass Button, public instance event Click

System.Web.UIClass Page, public instance event Load

Events in C#ASP.NET

C#

protected void btnNext_Click(Object S,ImageClickEventArgs E){ [ ... do something ... ]}


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Section 4: Advanced ASP.NET


Server Controls

Working with Data

Web Applications

Migrating from ASP to ASP.NET


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Web Forms Overview 1/2

thisfile.aspxSubmitBtn_Click(){ ...

thisfile.aspx.cs......


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Web Forms Overview 2/2

Create programmable Web pages Use any .NET programming language

Provides a rich set of server-side controls

Web Forms event model

Run on any browser

Visual and logic parts of your Web application

System.Web.UI.WebControls namespace


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Sample Web Forms

private void SubmitBtn_Click(object s, SystemEventArgs e){ Message.Text=Hi & Name.Text} Name:

thisfile.aspx.cs:

thisfile.aspx:


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Black boxes providing specific functionality

Exposed over the Internet

To be consumed by applications independent of

Operating system

Programming language Component model

Web Services


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Web Services Overview 1/2

For the most part, similar to COM programming

Based on simple, open standards

XML-based communication

Communication = MessagingClient and Web Service are loosely coupled

URLthe key to Web Services

http://///?var=value


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Web Services Overview 2/2

Web Service Wire Formats HTTP: GET and POST

SOAP

Web Services Description Language (WSDL)

XML-based

Abstract description of the Web Service

Transactions

ASP.NET transactions = COM+ transactions


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Sample Web Service

using System.Web.Services;public class MyClass : System.Web.Services.WebServices{ [ WebMethod ]public int Compute1(int i1, int i2){ return i1 + i2;}

public int Compute2(int i1, int i2){if (i1 > i2) return i1 - i2;else return i2 - i1;}}


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Server Controls Overview

Web Forms Server Controls

Server Controls Families

HTML

ASP.NET

Validation

User

Mobile

Data Binding

Page Class

Reunion of code and content

S C


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Server Control Families 1/2

HTML Server Controls Map directly to HTML elements

HTML attributes

Samples: HtmlAnchor(), HtmlTable ()ASP.NET Server Controls

Abstract controls

No one-to-one mapping to HTML server controls

Typed object modelAutomatic browser detection

Rich set of controls

Sample: TextBox ()

S C l F ili


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Server Control Families 2/2

Validation Controls

Check user input

Different types of validation

Required entry

Comparison, range checking, pattern matching

User defined

User Controls (Pagelets)

Partition and reuse UI functionality

.ascx file name extension Object model support

Mobile Controls

S C t l S t


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Server Controls: Syntax

Focusing ASP.NET Syntax controlName

TextBox, DropDownList, and so on

attributes Id=controlID runat=server

S C t l S l


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Server Controls Sample

foreach (Ivalidator val in Page.Validators){ val.Validate();}

Checkout.aspx:

Checkout.aspx.cs:

W ki ith D t


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Working with Data1/3

SQL and XMLAccess and manipulate data

Managed data access APIs provided by the runtime

Essential Objects OleDbConnection, OleDbCommand, and DataSet

Namespaces

System.Data and System.Data.OleDb

W ki ith D t


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ADO.NET Overview

Disconnected data architecture

Datasets are complete relational views of data

XML and XML schema

InternetData Object

Dataset

Windows

Form

Web Form

B2B

XML

W ki ith D t


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using System.Data;ShoppingCart.CalculateOrderSummary();DataRow row = ShoppingCart.OrderSummary.Rows[0];lblSubTotal.Text = System.String.Format({0:C},row[OrderData.SUB_TOTAL_FIELD]);

C#:

ASP.NET:

C hi


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Caching

Enhance performance of your Web application

Output Caching

Store and retrieve pages or objects

Page caching

Fragment caching

Expiration Rules

Cache APIs

Customize caching principles

W b A li ti


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Web Applications

ASP.NET defines a Web application as thesum of all files, pages, handlers, modules, andexecutable code that can be invoked or run in thescope of a given virtual directory on a web applicationserver

Distributed Applications

InternetWeb Service

Web Form

Presentation Middle Tier Database

ASP t ASP NET Mi ti


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ASP to ASP.NET Migration

ASP and ASP.NET can coexist on the same server

Make use of ASP.NET features

To migrate, ASP files must be modified

Migration Wizard generates codebehind Add existing item and Rename

Performance

Managed vs. unmanaged code

Early vs. late binding

Mi ti I


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Migration Issues

Structure Code blocks and directives

Security

ASP.NET security was described earlier

Languages

C#, Visual Basic.NET

Data Access

ADO to ADO.NET

S


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Summary

Now you have been introduced to ASP.NET Configuration


Security

State Management

Accessing Data

Web Applications

Migration

Q estions?


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Questions?


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Duwamish Books

A Sample Application for Microsoft.NET

Installing the Sample


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Installing the Sample 1/2

Install the "Enterprise Samples" with Visual Studio.NET

Location of the C# Version

Visual Studio.NET folder

Directory .\EnterpriseSamples\DuwamishOnline CS

Location of the Visual Basic Version Directory .\EnterpriseSamples\DuwamishOnline VB

Installation Tasks

Check the prerequisites

Microsoft Windows 2000 Server; Microsoft SQL Server 2000

with English Query optional and supported

Read the Readme.htm

Run Installer Duwamish.msi (double-click it)

Installing the Sample


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Installing the Sample 2/2

The installation wizard will guide you

Defaults should be OK for almost everybody

Setup will install database, Web site, and code

After installation is complete: Visual Studio.NET

Open the Duwamish.sln file with File/Open Solution

Can build the sample with Build/Build Solution

.NET Framework SDK Can build from command line with:

nmake /a -f duwamish.mak CFG= all is eitherDebug orRelease

Duwamish Architecture Overview


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User / Browser

IIS

Duwamish Architecture Overview

DataAccess

Database

C

ommon.Data

BusinessRules

BusinessFacade

SystemFramework

Web

ASP.NET

ADO.NE

T

Common Components


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Common Components

Duwamish7.Common

Contains systems configuration options

Contains common data definitions (classes)

Namespace Duwamish.Common.Data

"Internal" data representation for Book, Category,Customer, OrderData

Duwamish7.SystemFramework

Diagnostics utilities

Pre and post condition checking classes Dynamic configuration

In short:

Everything that's pure tech and not business code

Duwamish7 DataAccess


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Duwamish7.DataAccess

Contains all database-related code

Uses ADO.NET architecture

Using SQL Server managed provider

Shows DataSet, DataSetCommand usage

Optimized for performance by using stored procs

Duwamish7 BusinessRules


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Duwamish7.BusinessRules

Implements all business rules Validation of business objects (Customer EMail)

Updating business objects

Calculations (Shipping Cost, Taxes)

All data access performed through DataAccess

Duwamish7 BusinessFacade


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Duwamish7.BusinessFacade

Implements logical business subsystems CustomerSystem: Profile management

OrderSystem: Order management

ProductSystem: Catalog management

Reads data through DataAccess

Data validated and updated using BusinessRules

BusinessFacade encapsulates all business-related

functionality

Duwamish7 Web


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Duwamish7.Web

Implements the user interface for Web access

Uses ASP.NET architecture

Employs Web Forms model

Uses code behind forms

Manages state

Uses custom Web controls

All functionality accessed through BusinessFacade

Shop at Duwamish Online NET


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Shop at Duwamish Online.NETDemo: Duwamish in Action

Exploring Duwamish Web


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Exploring Duwamish.Web

Exploring ASP.NET Features in Duwamish7.Web

Legal Notices


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Legal Notices

Unpublished work.

2001 Microsoft Corporation. All rightsreserved.

Microsoft, JScript, Visual Basic, Visual Studio, and Windowsare either registered trademarks or trademarks of MicrosoftCorporation in the United States and/or other countries.

The names of actual companies and products mentionedherein may be the trademarks of their respective owners.

Date post:	03-Apr-2018
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