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Asp.Net : What is it?
Microsoft's is a server-side scripting technology that can be used to create dynamic and interactive Web applications. An page is an HTML page that contains server-side scripts that are processed by a web server before being sent to the user’s browser. You can combine ASP with Extensible Markup Language (XML) and Hypertext Markup Language (HTML) to create powerful interactive Web sites. coding is more "compact" than ASP code; the scripts required to perform a given function are shorter in than they are in ASP.
Since the server-side script is building a regular HTML page, it can be served to almost any browser. An  file can be created by using any text editing tool, such as notepad.

Asp.Net : What it does? 
Microsoft ASP.NET is more than just the next generation of Active Server Pages (ASP). It provides an entirely new programming model for creating network applications that take advantage of the Internet.
Improved Performance and Scalability • Compiled Execution: ASP.NET is much faster than classic ASP, while preserving the "just hit save" update model of ASP. No explicit compile step is required. ASP.NET automatically detects any change, dynamically compiles files if needed, and stores the compiled results to reuse for subsequent requests.
• Rich Output Caching: ASP.NET output caching can dramatically improve the performance and scalability of your application. When output caching is enabled on a page, ASP.NET executes the page once and saves the result in memory before sending it to the user. When another user requests the same page, ASP.NET serves the cached result from memory without re-executing the page. 
• Web Farm Session State: ASP.NET session state lets you share session data across all machines in a Web farm. Now a user can hit different servers in the Web farm over multiple requests and still have full access to session data.
Enhanced Reliability • Memory Leak, Dead Lock, and Crash Protection: ASP.NET automatically detects and recovers from errors such as dead locks and memory leaks to ensure that your application is always available.
Easy Deployment
• "No Touch" Application Deployment: With ASP.NET you can deploy an entire application by copying it to the server. Configuration settings are stored in an XML file within the application.
• Dynamic Update of Running Application: ASP.NET lets you update compiled components without restarting the Web server. Unlike classic COM components that required the Web server to be manually restarted when an update was deployed, ASP.NET automatically detects the change and starts using the new code.
• Easy Migration Path: ASP.NET runs side by side on IIS with classic ASP applications on Microsoft Windows 2000 and Windows XP, and on members of the Windows Server 2003 family. You can migrate one application at a time, or even single pages. ASP.NET even lets you continue to use your existing classic COM business components.
New Application Models
• XML Web Services: XML Web services allow applications to communicate and share data over the Internet, regardless of operating system or programming language. ASP.NET makes exposing and calling XML Web services simple. 
• Mobile Web Device Support: ASP.NET mobile controls let you target over 80 mobile Web devices using ASP.NET. You write the application once, and the mobile controls automatically generate pages for the requesting device. 
Developer Productivity
• Easy Programming Model: ASP.NET makes building real-world Web applications dramatically easier with server controls that let you build great pages with far less code than classic ASP.
• Flexible Language Options. ASP.NET supports not only Microsoft Visual Basic Scripting Edition (VBScript) and Microsoft JScript but also more than 25 .NET languages, including built-in support for Visual Basic .NET, Microsoft C#, and JScript .NET.
• Rich Class Framework: The .NET Framework class library offers over 4,500 classes that encapsulate rich functionality such as XML, data access, file upload, regular expressions, image generation, performance monitoring and logging, transactions, message queuing, and SMTP mail.

Why ?

• ASP.NET drastically reduces the amount of code required to build large applications
• ASP.NET makes development simpler and easier to maintain with an event-driven, server-side programming model
• The source code is executed on the server. The pages have lots of power and flexibility by this approach
• The source code is compiled the first time the page is requested. Execution is fast as the Web Server compiles the page the first time it is requested. The server saves the compiled version of the page for use next time the page is requested
• ASP.NET makes for easy deployment. There is no need to register components because the configuration information is built-in.