 Internet providing backbone for applications  Use of several web sites and devices to provide one complete solution  Software as services  Quick software product development by leveraging third party web accessible components  Enriching user experience  Dollar rental car integration with Southwest airlines..NET Vision ILM Proprietary and Confidential -

 Internet providing backbone Internet ETrade Web Service Portfolio Management Spread Sheet Stock Market Stock Market.NET Vision ILM Proprietary and Confidential -

Shopping Cart Service Order Shipment Service Online Store A Internet Product Catalog Service .NET enabled e-Commerce Site Authentication Service Online Store B.NET Vision ILM Proprietary and Confidential -

 Replacement of existing development tools  Introduction of new development tools  New line of server products such as Commerce Server 2000 Implications On Technology ILM Proprietary and Confidential -

Most Microsoft’s development tools will become obsolete when.NET is released  VB, ASP, C++, ADO are out  VB.NET, ASP.NET, C++.NET, and ADO.NET are in Development API’s such as Win32, MFC will be replaced with completely new framework APIs COM/DCOM is obsolete Tools Replacement ILM Proprietary and Confidential -

Completely new programming language called C#, build specifically for.NET development Tool support for creating web services Completely new development framework APIs New Tools ILM Proprietary and Confidential -

Commerce Server 2000 BizTalk Server 2000 Application Center 2000 Exchange Server 2000 SQL Server 2000 And more.NET Enterprise Servers ILM Proprietary and Confidential -

New web-service based e-Business model Cost of upgrading/re-engineering existing software products Cost of re-tooling technical staff Might need to hire or contract.NET experts as mentors.NET Impact ILM Proprietary and Confidential -

Common runtime framework across all languages  Managed code execution  Intermediate language  Just In Time (JIT) compilation  First class citizen programming languages Unified Type System Garbage Collection Versioning and deployment support Cross language integration Interoperability with unmanaged code.NET Framework - Core Features ILM Proprietary and Confidential -

C++ C# VB JScript Third Party Languages.NET Framework All Languages use.NET framework for all of their needs ILM Proprietary and Confidential -

Managed C++ MSIL Code (Assembly) Machine Code Compiler Just In Time Compiler Common Language Runtime (CLR) Manages C#VB.NETJScriptThird Party Languages ILM Proprietary and Confidential -

IL gets compiled into CPU dependent executable code as needed.NET can optimize the executable code for various CPU kinds.NET performs type safety on IL before JIT compiling it into executable code JIT Compilation ILM Proprietary and Confidential -

Regular JIT  Compiles one method at a time as needed  Used when small, fast, platform-specific code is required and the time required for optimization is not an issue Fast-JIT  Converts IL to executable code very quickly without performing any optimization Pre-JIT  Converts IL to executable at installation time. Converts larger units at a time JIT Compilation ILM Proprietary and Confidential -

Unified Type System All types are defined in.NET framework All types are shared among all.NET enhanced programming languages Types in.NET runtime are defined as classes, interfaces, and value types ILM Proprietary and Confidential -

Automatic Memory Management Garbage Collector  Starts up when system runs low on memory  Runs as a low priority thread  Objects become candidate for garbage collection when they go out of scope  You can explicitly initiate garbage collector but it is not recommended No deterministic finalization  Don’t use destructors to free up external resources  Use Dispose method instead ILM Proprietary and Confidential -

Assembly is reusable binary, such as COM component Assembly contains Meta data and MSIL code Meta data contains  Manifest  Type definition  Method signature  References to external objects Assembly can be a component (.dll) or a standalone executable (.exe) Self describing. No more IDLs needed Assembly ILM Proprietary and Confidential -

ILDASM (Intermediate Language De-assembler) ILM Proprietary and Confidential -

Manifest ILM Proprietary and Confidential -

Forms a security boundary  An assembly is the unit at which permissions are requested and granted Forms a type boundary  Every type has the assembly name as part of its identity Forms a version boundary  All types in the same assembly are versioned as a unit Forms a deployment unit Forms a unit at which side-by-side execution is supported Assembly ILM Proprietary and Confidential -

The end of DLL hell Side by side execution Private assemblies  Installed in application’s folder  Only accessible by your application  Versioning rules are not enforced Shared assemblies  Installed in WinNT/Assembly folder  Accessible by all applications  Versioning rules are enforced Deploying.NET Applications ILM Proprietary and Confidential -

Assembly Version Numbers ( ) MajorMinorBuildRevision Incompatible ChangeCompatible Change (Hot Fix) Deploying.NET Applications  By default.NET runtime will pick the assembly with highest compatible build number ILM Proprietary and Confidential -

Object can call method on other object written in different language Object can inherit from other object written in different language Object can pass instance of a class to other object written in different language.NET debugger will be able to step through code written in different languages.NET runtime will enable exceptions to be handled the same way across different languages Cross Language Integration ILM Proprietary and Confidential -

.NET assemblies can talk to COM components using Runtime Callable Wrapper (RCW)  RCW translates COM types to.NET type  RCW translates HResult to.NET exceptions  RCW manages reference count on COM object COM Components can talk to.NET assemblies using COM Callable Wrapper (CCW) .NET types are converted into COM types .NET exceptions are converted into HResult Interoperability With COM ILM Proprietary and Confidential -