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• Overview of .NET• Visions and Goals of .NET• Building Blocks of .NET• .NET Languages• .NET applications• Interoperability between .NET and

Presentation Outline COM+

Overview

• A way to think about this new technology is

to view

.NET as a brand

, one that

Microsoft has applied to severaltechnologies.

• Some of the technologies are new

(providing new services and possibilities)and others allow an updated approach tocreating Windows applications that weknow today..

Overview

•^

Microsoft .NET

will affect anyone who

works in the Windows environment.However, Most Windows developers oncelearn and implement this new tools andtechniques will find themselves capable ofbuilding more powerful, more usefulsoftware in less time.

Why .NET?

Overview

•^

.NET framework

is new environment for

creating applications. Because thefoundation is the same, developers see amuch more consistent environment.

• The .NET framework includes: CLR

(Common Language Runtime) and the .NETFramework class library (ASP.NET,ADO.NET, Windows forms, EnterpriseServices, and much more).

The .NET Framework

Overview

Overview

•^

.NET My Services

is set of Internet-

accessible Web services. It allows users tostore and access the same personalinformation such as calendar from yourhome PC or Wireless PDA.

.NET MyServices

Clients

Applications

Internet

• .NET Enterprise servers

provide a useful

set of services (BizTalk Server 2000,Application Server 2000, Commerce Server2000, Host Integration Server 2000, SQLServer 2000, Exchange Server 2000, MobileInformation Server 2001, and InternetSecurity and Acceleration Server 2000).

Overview

• With COM, Reality of software plugand play.Net is much simpler to use. •^

COM supports

language

independence

-^

.Net supports

language integration

You can extend a class hosted in .Net andcan catch exceptions thrown by the codein .Net

COM

JAVA

C++

VB

.NET

Java

C++VB

How does .Net ensureLanguage Integration

• First, there is adherence to the common type

system (CTS). There are value types, whichare simple data types like integers and float,and reference types

• By enforcing the different types of data into

two generic types of data, multiplelanguages can intermingle with one another.

• Ensures code stability

How does .Net ensure language

integration

• Third, there is a unified, extensible class

library.

• Hundreds of classes, interfaces, types, and

structures grouped into a hierarchical systemof namespaces that contain logically relatedclasses.

• Full level of

Object-Oriented

Programming

support

How does .Net ensure language

integration

• Fourth, all different languages are compiled

into what is called Microsoft IntermediateLanguage (MSIL).

• Similar to Java bytecode, which must be

converted into native code by the commonlanguage runtime. JAVAC++Visual Basic

MSIL

How does .Net simplify

deployment compared to COM • Definitions of assembly, metadata, manifest• Avoid DLL

Hell

• Loads correct version of DLL files because

of the information contained in the metadataand manifest.

.NET Web Services