dotNETfinal.ppt

Microsoft .NET
ICS243F Presentation
by
Sudeep Pasricha
Manev Luthra

What is .NET?
 Microsoft® .NET is a set of Microsoft software technologies for connecting
information, people, systems, and devices
 It is a device and platform independent distributed computing model based
on Web Services (which are in turn based on open XML communication
technology), and consists of
 a software platform for building .NET experiences
 a programming model and tools to build and integrate XML Web services
 a set of programmable XML Web services
 a way to enable users to interact with a broad range of smart devices via the
Web, while ensuring that the user, rather than the application, controls the
interaction
 a way to provide a user with applications, services, and devices that are
personalized, simple, consistent, and secure
 .NET is all about creation, consumption and delivery of Web Services

What is a Web Service?
Small, reusable applications written in XML
Client to Client
- Clients can use XML Web
Services to communicate data
Client to Server
- Clients can send data to and
receive data from servers.
Server to Server
- Servers can share data with
each other.
Service to Service
- web services can work
together.

What are the Components of .NET?

.NET Experience
 .NET Experiences are XML web services
that allow you to access information
across the internet in an integrated way
 Products transitioning into the .NET
experiences are:
 MSN Website
 Visual Studio .NET Website
 Passport Website

.NET Clients
Clients are PCs, handheld computers, Tablet PCs,
game consoles (Xbox), smart phones …
All of them use XML Web Services
.NET client software includes
Windows CE
Windows XP
Windows Embedded
Windows 2000

.NET Services
XML Web Services
Offer a direct means for applications to interact
with other applications
First set of XML Web Services developed are
called .NET My Services (“HailStorm”)

.NET Servers
.NET Enterprise servers are Microsoft's
comprehensive family of server applications for
building, deploying, and managing scalable,
integrated, Web Services and applications
Designed with machine critical performance
Examples of .NET Servers:
MS Commerce Server 2000
MS Exchange Server 2000

.NET Tools
Microsoft Visual Studio .NET and Microsoft
.NET Framework supplies complete solution for
developers to build, deploy and run XML services
Visual Studio .NET is the next generation of
Microsoft’s popular multi-language development
tool built especially for .NET
Enhances existing languages like Visual Basic
with new OO features
Introduces C#

Web Services Revisited
 Web services are platform independent
 Encompasses Windows, Unix, Mac, Linux, even PalmOS
 Web services are agnostic of the object model being used
 Compatible with RPC, DCOM, CORBA, and Sun RMI
 Web services are loosely coupled
 Unlike tightly-coupled RPC and distributed object systems, which require all the
pieces of an application be deployed at once, you can add clients and servers to
Web-based systems as needed
 Web services are built on open standards
 XML, SOAP, WSDL, UDDI, HTTP, RPC
 Web services are compatible with existing object models
 Replaces internal "plumbing" of the network RPC wire format transparently to
user
 Web services permit secure transmission
 HTTPS, SSL

Web Services vs. Traditional Web
Applications
 Web services use SOAP messages instead of
MIME messages
 Browsers just need to render web pages; web
services need to do more
 Web services are not HTTP-specific
 SOAP messages can be sent using SMTP, raw TCP
or an instant messaging protocol like Jabber
 Web services provide metadata describing the
messages they produce and consume.
 XML Schema (XSD) is used to describe various
message structures

Extensible Markup Language
(XML)
 XML is the glue that holds .NET together
 XML is the defacto standard for data
interoperability.
 XML provides a way to put structured data
into a form that can be easily and quickly
transmitted and then interpreted at the other
end
 XML looks like HTML, and like HTML, it is
readable and text-based
 XML is license-free, platform-independent,
and well supported

Simple Object Access Protocol
(SOAP)

“SOAP provides a simple and lightweight
mechanism for exchanging structured and
typed information between peers in a
decentralized, distributed environment
using XML “
A SOAP message is based on XML and
contains the following parts:
 The Envelope is the top-level container
representing the message.
 The Header is a generic container for added
features to a SOAP message. SOAP defines
attributes to indicate who should deal with a
feature and whether understanding is optional
or mandatory.
 The Body is a container for mandatory
information intended for the ultimate message
receiver.

SOAP (cont’d)
 Soap is the communications protocol for XML Web services.
 SOAP is a specification that defines the XML format for messages—
and that's about it – a SOAP implementation will probably include
mechanisms for object activation and naming services but the SOAP
standard doesn't specify them
 Optional parts of SOAP specification describe how to represent
program data as XML and how to use SOAP to do Remote Procedure
Calls
 SOAP is much smaller and simpler to implement than many of the
previous protocols.
 DCE and CORBA took years to implement, so only a few
implementations were ever released; SOAP, however, can use existing
XML Parsers and HTTP libraries to do most of the hard work, so a
SOAP implementation can be completed in a matter of months – so
several implementations for it have been released (> 70 to date).
 SOAP obviously doesn't do everything that DCE or CORBA do, but the
lack of complexity in exchange for features is what makes SOAP so
readily available

Web Service Description Language
(WSDL)
 A Web Service Description defines all the supported
methods that a Web Service provides.
 WSDL is an XML grammar that developers and
development tools use to represent the capabilities and
syntax of a Web Service.
 Similar to IDL for COM and CORBA
 Imagine you want to start calling a SOAP method
provided by one of your business partners. WSDL
specifies what a request message must contain and
what the response message will look like in
unambiguous notation.

Universal Discovery Description
and Integration (UDDI)
 UDDI is the yellow pages of Web Services
 you can search for a company that offers the services you need, read about the
service offered and contact someone for more information
 A UDDI directory entry is an XML file that describes a business and the services it
offers.
 There are three parts to an entry in the UDDI directory
 "white pages" describe the company offering the service: name, address, contacts, etc.
 "yellow pages" include industrial categories based on standard taxonomies such as the North
American Industry Classification System and the Standard Industrial Classification.
 "green pages" describe the interface to the service in enough detail for someone to write an
application to use the Web service.
 UDDI defines a document format and protocol for searching and retrieving discovery
documents - which in turn link to DISCO documents.
 DISCO (Discovery of Web Services) is a Microsoft protocol for retrieving the
contracts for Web Services (WDSL documents).

Architecture Explained
 Web Services
 Top layer provides .NET users with Web Services for e-
commerce and business to business applications
 Frameworks and Libraries
 ASP.NET for developing smart web pages
 ADO.NET which is an XML based improvement for databases
and object relational processing
 Interchange Standards
 Platform independent means of exchanging objects
 SOAP (Simple Object Access Protocol)
 WSDL (Web Services Description Language)

Architecture Explained (cont’d)
 Development Environment
 Visual Studio .NET
 Visual C++, Visual BASIC, Visual C#
 Component Model
 Derived from original component based
development: CORBA, J2EE, COM
 .NET allows building “assemblies” consisting of a
number of classes with well defined interface
 IDL absent in .NET

Architecture Explained (cont’d)
 Object Model
 Conceptual basis for everything in .NET
 Common Language Runtime
 Basic set of mechanisms for executing .NET
programs regardless of language of origin

.NET Framework
Windows Forms
ASP.NET
Web Services
ASP.NET Application Services
Web Forms Controls Drawing
Windows Application Services
Framework Class Library
ADO.NET
Network
XML
Security
Threading
Diagnostics
IO
Etc.
Common Language Runtime
Memory Management Common Type System Lifecycle Monitoring

Framework Class Library
 The FCL is a hierarchical class library that can be utilized across
multiple languages and platforms.
 Contains reusable classes, interfaces, and components that can
be used for:
 Developing components and Web Services.
 Developing Windows Forms applications.
 Developing Web Forms applications.
 Working with Directory Services, Event Logs, Processes, Message
Queues, and Timers.
 Creating and managing threads.
 Managing application security.
 Key features and benefits
 Cross-Language Interoperability
 Consistent and Unified Programming Model
 Object-Oriented and Extensible Class Library

Common Language Runtime
 The CLR is at the core of the .NET platform - the
execution engine. A unifying framework for designing,
developing, deploying, and executing distributed
components and applications.
 Loads and runs code written in any runtime-aware
programming language (approx. 22 as of now).
 Manages memory, thread execution, type safety
verification and garbage collection.
 Performs compilation (Just In-time Compiler)
 Makes use of a new common type system capable
of expressing the semantics of most modern
programming languages. The common type system
defines a standard set of types and rules for creating
new types.
 Inheritance/Reference NOT dependent on source
language

MSIL and JIT Compilation
 Source code is compiled into MSIL (Microsoft Intermediate Language).
Similar to Java bytecode.
 MSIL allows for runtime type-safety and security, as well as portable
execution platforms (all Windows). MSIL code cannot play tricks with
pointers or illegal type conversions.
 The MSIL architecture results in apps that run in one address space -
thus much less OS overhead.
 Compilers also produce “metadata”:
 Definitions of each type in your code.
 Signatures of each type’s members.
 Members that your code references.
 Other runtime data for the CLR.
 Metadata along with the MSIL enables code to be self-describing - no
need for separate type libraries, IDL, or registry entries.
 When code is executed by the CLR, a JIT compilation step occurs.
Code is compiled method-by-method to native machine code.

Packaging: Modules, Types,
Assemblies, and the Manifest
Assembly
Manifest
Module
Metadata
MSIL
Type Type
Type

 A “module” refers to a binary, such as an EXE or
DLL.
 Modules contain definitions of types, such as classes,
interfaces, structures, and enumerations.
 An assembly contains a “manifest”, which is a catalog
of component metadata containing:
 Assembly name.
 Version (major, minor, revision, build).
 Assembly file list - all files “contained” in the assembly.
 Type references - mapping the managed types included in
the assembly with the files that contain them.
 Scope - private or shared.
 Referenced assemblies.
 No MSIL code can be executed unless there is a
manifest associated with it.

 An assembly can be defined as one or more modules
that make up a unit of functionality. Assemblies also
can “contain” other files that make up an application,
such as bitmaps and resource files.
 An assembly is not a physical file.
 An assembly is the fundamental unit of deployment,
version control, activation scoping, and security
permissions.
 Two types of assemblies:
 Private - Usually deployed in the same directory as the client
application and used only by a single application.
 Shared - Used by any application and usually installed in a
special Global Assembly Cache.

.NET Component Model
 Offers developers an component model directly
based on OO.
 Removes distinction between a program element and
a software component. Thus it provides significant
benefits over technologies like CORBA and COM.
 .Net gets rid of the IDL - we can use a .Net assembly
directly as a component.
 Uses interface documentation already present in the
source code. Compliers for .Net supported languages
retain this information as metadata - self documented
components.
 Metadata is also available in XML format, any
application whether it is a part of .NET or not can
obtain information about components.

Microsoft C#
 A modern, object-oriented programming
language built from the ground up to exploit the
power of XML-based Web services on the .NET
platform.
 The main design goal of C# was simplicity rather
than pure power.
 Features of C#
Simplicity Type Safety
Consistency Version Control
Modernity Compatibility
Object Orientation Flexibility

.NET security
 The .NET Security Framework Architecture consists of
the following five core elements:
 Evidence Based Security - At runtime, the CLR determines
permission requests by evaluating the assembly’s evidence.
 Code Access Security - allows code to be trusted to varying
degrees, depending on where the code originates and on other
aspects of the code's identity.
 Verification - during JIT, the CLR ensures memory type safety.
 Role Based Security - .NET applications can make
authorization decisions based on identity and role membership.
 Cryptography - The .NET Framework provides Random
Number Generation and other Cryptographic services.

Conclusion
 .Net creates a new concept, “the Internet Operating
System”.
 .Net allows cross-platform development to an extent
not before possible.
 .Net web services can be integrated into existing
distributed object technologies today by replacing
their RPC wire protocol with SOAP .
 Large-scale distributed application development and
deployment become possible on a level that presents
major difficulties today.
 Stricter versioning policies help to ensure greater
stability during upgrades, even in shared libraries.
 "Software as a service" - a subscription model for
application deployment - becomes a feasible option.

dotNETfinal.ppt

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