Transcript Intro to dot Net

Intro to dot Net
Dr. John Abraham
UTPA
CSCI 3327
What is .Net?
.NET is an Internet and Web based
infrastructure
.NET delivers software as Web
Services – XML based.
.NET will run in any browser on any
platform
.NET Framework is the infrastructure
for the new Microsoft .NET Platform.
What are Web Services?
• Applications that run on a web server
and communicate with other
applications.
• The basic Web services platform is
XML + HTTP
• Web services platform elements
– SOAP (Simple Object Access Protocol)
– UDDI (Universal Description, Discovery
and Integration)
– WSDL (Web Services Description
Language)
SOAP
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Simple Object Access Protocol.
SOAP is a communication protocol
SOAP is for communication between applications
SOAP is a format for sending messages
SOAP is designed to communicate via Internet
SOAP is platform independent
SOAP is language independent
SOAP is based on XML
SOAP is simple and extensible
SOAP allows you to get around firewalls
SOAP will be developed as a W3C standard
UDDI
• Like the yellow pages of Web services
• Universal Description, Discovery and
Integration
• UDDI is a directory for storing information
about web services
• UDDI is a directory of web service
interfaces described by WSDL
• UDDI communicates via SOAP
• UDDI is built into the Microsoft .NET
platform
WSDL
• Web Services Description Language
• WSDL is written in XML
• WSDL is an XML document
• WSDL is used to describe Web
services
• WSDL is also used to locate Web
services
What is .Net built on?
Windows Servers such as:
SQL
Application Center
Commerce Server
Mobile Information Server
Exchange Server
BizTalk Server
Internet Security
Host Integration
.Net Framework
A software platform
Language-neutral
Designed for cross-language
compatibility.
App written in VB.net may reference a
DLL file written in any other language
2 components:
Common Language Runtime (CLR)
Class Libraries
Common Language Runtime
Execution Engine of .NET
Manages the execution of programs
and provides core services:
Code compilation
Memory allocation
Thread management
Garbage collection
Common Type System (CTS) enforces
safety.
CLR contd.
Output of .Net compilation contains a special
type of code called Microsoft Intermediate
Language (MSIL); it is not executable.
• MSIL is independent of any specific CPU.
• CLR translates MSIL to executable code
when the program is executed
• Executable code is produced using JIT
(just in time) compiler. The native code
produced by JIT is specific for the CPU.
Class Libraries
designed to integrate with the common
language runtime.
This library gives the program access to
runtime environment.
The class library consists of lots of
prewritten code that all the applications
created in VB .NET and Visual Studio .NET
will use.
The code for all the elements like forms, and
controls actually comes from the class
library.
Some reasons why developers
are building applications using
the .NET Framework:
• Improved Reliability
Increased Performance
Developer Productivity
Powerful Security
Integration with existing Systems
Ease of Deployment
Mobility Support
XML service Support
Support for over 20 Programming
Languages
Flexible Data Access
Writing a VB project
• Designing screen layout
• Create data input and output objects
• Create event buttons
• VB automatically recognizes mouse
movements, clicks, keyboard actions,
etc.
• Write procedures to make use of
these activities (events).
Event driven programming
• Different from procedural
programming
– Starts with line one, executes
sequentially unless branched.
• VB executes procedures as events
occur