ARCHITECTURE OF ASP.NETHTTP REQUEST inet_info.exeMachine.configWeb.configHTTP RESPONSEAspnet_isapi.dllAsp.dllProcess ReqWeb ServerASP.net Runtime EnvAspnet_wp.exeApp DomainHTTP Handlers(.aspx)(.asp)

Inet_info.exe identifies the request and submits the request to the aspnet_isapi.dll.Aspnet_isapi.dll is a script engine which process the .aspx pageThen the script engine will submit the request to the ASP.NET runtime env.After verifying all the security issues of both machine.config and web.config then an AppDomain will be defined for the request and after processing the request the response will be given to the client as HTTP response.Machine.Config it is used to maintain the complete configuration details of all the web applications registered on to the web server of ASP.netWeb.Config It is used to maintain the config details about a single web application.Where configuration details includes security,database connectivity,state management,trace details of the web application,,authentication and authorization of the applications and globalizations

AppDomain:All windows appns run inside a process and these process own resources such as memory and kernel objects and the threads execute code loaded into a process.Process are protected from each other by the OS. All these appns are run on high isolation mode to work safely.The disadvantage of this is memory resources are blocked.So to achieve this in a single process all the applications should be made to run which is good to an extent but the draw back is if one crashes all other are effected. So in .net the code verification feature takes care that the code is safe to run. so asp.net each application runs its own application domain and therefore it is protected from other asp.net applications on the same machine so it ignores the process isolation specified on IIS.

HTTPHandlers:ASP.net builds upon a extensible architecture known as HTTP runtime.This is responsible for handling the requests and sending the response.It is upto an individual handlers such as asp.net or web service to implement the work done on a request.IIS supports a low level API known as ISAPI. ASP.net implements a similar concept with HTTP handlers.A request is assigned to ASP.net from IIS then ASP.net examines entries in the section based on the extension of the request to determine which handler the request should be send to.

Features of asp.netASPX,ASPUp gradation of ASP to ASPX is not required it supports side by side execution and hence a request can be given from ASP to ASPX and vice versa.Simplified Programming ModelASP.Net is a technology which can be implemented using any dot net language such as VB.net,C# etc and hence there is no requirement of HTML,JavaScript or VBScript to implement ASP.NETSimplified deployment ASP.Net supports setup and deployment and hence the web app can be defined with a web set up project which can be easily deployed on to the web server. Where as for ASP CUTE FTP is used for deploying manually we have to upload.

Better PerformanceAs the ASPX pages are complier based the performance of the web application will be faster then the ASP pages (as they are interpreter based)CachingIt is a process of maintaining the result or output of a web page temporarily for some period of time .ASP supports Client Side caching where as ASP.Net supports both client side and server side.SecurityIn ASP security is done by IIS or writing the code manually. Where as ASP.Net is defined with built in security features such as windows authentication Forms Authentication Passport Authentication Custom Authentication

Features of asp.netMore powerful data accessASP.net supports ADO and ADO.Net as its database connectivity model which will be implemented using the most Powerful OOPS languages like VB.Net and C# and hence the database access using ASPX pages will be very powerful.Web servicesIt is a code which will be published on the web which can be used by any applications written using any language for an platform or device.Better session ManagementSession Management in ASP.Net can be maintained using the database and as well cookieless sessions are also supported.It also supports enabling and disabling of session info within a web application.Simplified Form ValidationsASP.Net provides validation controls using which any type of client side validations are performed without writing any code.

A web page is in 2 parts 1} Designing part (HTML Content,Flash,Dreamweaver etc) 2} logic Part (sub programs and event procedures and it has also your database interaction)ASP.Net supports 2 techniques for creating web page 1) In Page Technique when you place design part code and logic part code with in a single file called as ASPX then it is called as inPage Technique. 2) Code Behind Technique when design part code is represented with in ASPX file and logic part code is represented with in dll file then it is called as code behind technique.ASP Supports only In Page technique.DLL file is not a readable file so it is secured.