using .net basic language

7/29/2019 using .net basic language

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Module3:Using Microsoft .NET-

Based Languages


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Module 3:

Using MS .NET-Based LanguagesIntroduces the different languages that areavailable for use when developing .NET-based

web applicationsLater, youll be able to identify the languagesthat support the .NET Framework and be able tochoose an appropriate development languagefor your needs

VB.NET @ C#


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OverviewOverview of the .NET-Based Languages

Comparison of the .NET-Based Languages


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Lesson: Overview of the .NET-

Based LanguagesMultiple Language Support

The Common Language RuntimeThe Common Language Runtime Components

Runtime Compilation and Execution


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Multiple Language SupportThe .NET Framework is designed to support manylanguages

More than 20 languages currently supported

Microsoft provides Visual Basic .NET, C#,

Visual J# .NET, and JScript .NET

Benefits of multiple-language support

Code modules are reusable

API access is the same for all languagesThe right language is used for the right task

Performance is roughly equal between all languages


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VB.NET

MS Jscript.NET

Perl

Haskell

Mercury

SmallTalk

APLC#

Oberon

Python

Pascal

Eiffel

CAML

C

MS J#.NET

Scheme

COBOLML

ADA

MV C++


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MS .NET-Based Language.NET Framework is designed to support an

unlimited number of development languages

It allows developers to use their preferredlanguage when developing .NET applications


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The Common Language RuntimeOne runtime for all . NET-Based Languages

Manages threads and memory

When objects are no longer used by a .NET application, theruntime perform garbage collection, which frees up thememory that was used by those objects

Enforces code security

Eliminates (dynamic-link library) DLL versioningproblemsMultiple versions of a DLL can run simultaneously

Applications can specify a version of a DLL to use


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The Common LanguageRuntimeComponents

.NET Framework Class Library Support

Thread Support COM Marshaler

Type Checker Exception Manager

MSIL to NativeCompilers

CodeManager

GarbageCollector

Security Engine Debug Engine

Class Loader


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Component Description

Class

Loader

Manages metadata, in addition to the loading and layout of

classes

MSIL to

native

compiler

Converts MSIL to native code (just-in-time [JIT]

compilation)

Code

manager

Manage code execution

Garbage

collector

Provide automatic lifetime management of all of your

objects. This is a multiprocessor, scalable garbage

collector

Security

engine

Provides evidence-based security that is based on the

origin of the code and the user

Debug

engine

Allows you to debug your application and trace the

execution of code


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When an object is no longer used by an

application, the GC cleans up the memory

GC prevents memory leaks caused byapplication that do not release all resources


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Component Description

Type

checker

Will not allow unsafe casts or uninitialized variables. MSIL

can be verified to guarantee type safety

Exception

manager

Provides structured exception handling, which is

integrated with MS Win structured exception handling

(SEH)

Thread

support

Provides classes and interfaces that enable multithreaded

programming

COM

marshaler

Provides marshaling to and from COM

.NET

Framework

Class

Library

support

Integrates code with the runtime that supports the .NET

Framework Class Library


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Runtime, Compilation and Execution

Native

code

C# code Visual Basic .NET code

Which language?

Visual Basic .NET

compiler

C#

compiler

MSILJITcompiler

default.aspx

Runtime


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Runtime, Compilation and ExecutionLanguage Compilation

A web browser request a Web page from a Web

server that is running IIS.The requested Web page, default.aspx, is compiled

with the appropriate language compiler, depending

on the language that is used to write the page.

The application is compiled to MSIL


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Runtime, Compilation and ExecutionJIT Compilation

The MSIL is handled by the runtime.

The runtime uses a JIT compiler to compile the MSILto native code.

After the application is JIT compiled, it is cached so

that it does not need to be recompiled for eachrequest.


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Runtime, Compilation and ExecutionApplication Execution

After the application is compiled , the runtime

executes the application on the Web server and thengenerates the HTML and script that is returned to the

client.


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Lesson: Comparison of the .NET-

Based LanguagesVisual Basic .NET

C#

Choosing a Language


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Visual Basic .NET

Visual Basic .NET is the latest version of Visual Basic

True object-oriented language

Visual Basic Scripting Edition (and JScript) are still used for client-

side script

Protected Sub Button1_Click(ByVal sender As Object, ByVal e AsSystem.EventArgs) Handles Button1.Click

Dim i As Integer = 0

Dim x As Double = TextBox1.Text

For i = 0 To 4

x *= 2

Label1.Text = Label1.Text & x & ","

NextEnd Sub


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C#C# is a new language

Similar to Java, Visual C++, and Pascalprotected void Button1_Click(object sender, EventArgs e){

int i = 0;double x = Convert.ToDouble(TextBox1.Text);for (i=0; i


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Choosing a Language

VB.NET @ C#


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Choosing a Language.NET Framework class library is the same regardless oflanguagePerformance

All languages are compiled to MSIL

Only performance difference is how each language

compiler compiles to MSILThe runtime compiles all MSIL the same, regardless of itsorigin

Development experienceC# is similar to Java, C, Visual C++, and PascalVisual Basic .NET is similar to Visual Basic

Browser compatibility

ASP.NET code is server-side code, so browser

compatibility is not an issue


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ReviewOverview of the .NET-Based Languages

Comparison of the .NET-Based Languages


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ExerciseWhat role does the CLR play in running

ASP.NET page?

What is the role of JIT compilation?

List FOUR languages that are currently

supported by .NET.

What is garbage collection and why is it so

useful in the .NET Framework?


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~ End of Module 3 ~

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using .net basic language