ASP.Net Basics.
Asp.net is a technology(not a language), which is runs at server side. It is used to develop the web applications.
ex: 1.Intranet Apps.
2.Internet Apps.
3.Mobile Apps.
- All modern apps are developed with asp.net.
- ASP is classical and it is not .net based.
- ASP.Net is collection of objects(comming from .net).
.NET is a frame work that contains 2 things.
1. Libraries, and 2. Run time.
- ASP.Net comes under libraries.
- .NET contains 13,000 classes. To day among those ASp.net might contain about 2000 classes.
Today's Applications.
1.Desktop applications.
2.Web applications.
3.Mobile applications.
4.Web services.
SOA =>Service Oriented Architecture.
SOA is the most important architecture in present days. Web service methods are part of web services.
1. Desktop applications.
It uses the resources of the client.
-- High performance.
-- High security.
-- Accessibility is low.
EX: MS Word, MS Paint , Yahoo messanger.
2. Web applications.
Resources or applications are reside in the user.
-- Performance is low.
-- Security is low.
Since web applications are used anywhere.
EX: Google, Gmail, Amazon.com, Bank.com...........etc.
3. Mobile applications.
Resources are client and server.
-- Performanance is low.
-- Security is low.
-- Accessibility is high.
EX: Personal data book, SMS application, Blue tooth, Mail applications.........etc.
4. Web services.
It is a model from Business to Business process to Application to Application service oriented architecture.
SOA is the most important in web services.
EX: Courier services.
Web services have all the factors of web application.
=> ASP.Net is developed for
- Web apps.
- Mobile apps.
- Web services.
=> Now a days 10% uses desktop apps and remaining 90% are using the other 3 apps.
=> ASP.Net is not a language, but used for a language i.e C#, VB.net......
==> .NET Frame work.
image2......
==> Web applications architecture.
image3......
- Web server is a software that takes all requests which are in the form of HTTP.
- Data base server would respond for all SQL.
- Web applications run under web server.
- All clients can request the server by HTTP.
- Browser is also a software which is responsible for sending the request to the web server in the form of HTTP.
- HTTP is a open standard protocol it is not a client or any vendor.
- Yahoo messanger doesn't follow the rules i.e why it is not a web application(It doesn't run under web server).
IIS: Microsoft Internet Information Server.
Asp.Net runs only under IIS .
It runs only on windows.
Latest version is 7.0.
=> To check IIS is present or not (i.e web server).
- Open Internet Explorer and type as http://computer name or http://localhost
- Will display a wel come page if web server is running otherwise an error.
- Every web server when we install provides a console from where we can create web application.
- IIS also provides a console i.e allowos user to create web application.
=> In Win XP/2000/2003
Settings >> control panel >> administrative tools >> Internet information services(program)(is the location)(int service manager).
-- Go to default web site and entire list shown is list of web apps that are already present.
** Computer identified with the TCP/IP address.
-- Web servers (or other servers) are identified with a port no(that is IP/computer).
-- port no is one way through which operating system runs services.
IQ. By default what port no is used?
Ans: All web servers by default run under port no 80(http).
-- Oracle runs by default port 1521.
-- If web servers run under different port numbers, then explicitly we must mention it is the request.
EX: http://nit/webapp1 It means http://nit:80/webapp1.
-- Go to default web site properties to change or check the port number.
==> How to create web application under web server(IIS)?
Right click on default web site and select new >> virtual directory.
-- IIS would respond with a wizard asking for virtual name and physical or actual name. Just fill both and now your web application is ready.
Virtual: name of web application.
Physical: content of web application.
