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Architecture is an important feature and the very first step in the development of an application. n-Tier the term is used for multiple tier or multiple layers. n-Tier Architecture splits the solution process into different projects based on the business requirements. The main advantage of using n-Tier is that the complexity associated with the business and the process is reduced and it is easy to work with. The elements of performance, scalability and future development issues need to be considered when deciding on the architecture of the application depending on the priorities required.

N-tier application, there are three levels or layers, they are known as the presentation layer, business layer and data layer. The bottom layer of each layer interaction, and there is a specific function to perform. Presentation layer is responsible for the user interface displays either the programmer or end-user. The programmer to use this design purposes, and to obtain data layer back and forth. It is included in the ASP.NET ASPX pages, user controls, server controls, and sometimes security related classes and objects.

The business layer acts as an intermediary to transmit the data from presentation layer. In the three-tier architecture the data access layer is not made to interact with the presentation layer. The architecture in ASP.NET includes using SqlClient or OleDb objects to retrieve, update and delete data from SQL Server or Access databases and passing the retrieved data to the presentation layer in a DataReader or DataSet object or a custom collection object . The data layer is the data from the business layer and sends them to the database or vice versa. This layer is divided into two sub layers Business Logic Layer (BLL) and Data Access Layer (DAL). DAL is used to access data and forwards it to BLL responsible. In ASP.NET it uses SqlClient or OleDb to retrieve the data and send it in the form of a DataSet or DataReader BLL. BLL (Business Logic Layer) is the production or processing of the data retrieved and sends it to charge the presentation layer.

The data layer gets the data from the business layer and sends it to the database or gets the data from the database and sends it to the mattress business. In ASP. NET is a SQL Server or database in Access. It can also Oracle, MySQL or even XML.

N-tier architecture in ASP.NET pages does not make a direct call to the database. Only a given layer of communication with the surrounding layers. ASP.NET pages should reference custom objects custom business object layer. These objects provide a class structure of the database information.

The partitioning of ASP.NET applications into front-end, middle tier and back-end layers, the n-tier architecture supports a single, building-block approach to application design. Hardware and software for the presentation, application and database functions can be individually scaled, and containing more easily into complex e-business environments.

In short ASP.NET web development of next-generation version of Microsoft's ASP, is a programming language framework used to create business-class websites that are fully on its n-tier architecture based on Microsoft. NET software development services and custom make. NET Developmenteasy.

Asp.net greater than ASP Classic. There are four key areas that make ASP.NET a much better choice for developers. These four areas include: stability, performance, scalability and language support.

#1 Stability

ASP is running under inetinfo.exe (IIS) process space, making it vulnerable to application crashes. This happens because the IIS must be stopped or restarted at regular intervals. The process is separate from inetinfo.exe ASP.Net, which means that they are not vulnerable to this type of application crashes. This means that the final product will be much more stable.

#2 Compilation

Classic ASP VBScript or JScript is interpreted to include runtime is on every page of a specific performance losses caused by line by line interpretation. The interpretation of the results pages, just in a certain inefficiency.

ASP.NET however compiles the code the first time it is accessed. The compiled code results in .NET classes housed within assemblies and allow subsequent page requests to be serviced with previously compiled code. ASP.NET therefore inherently provides a more secure and largely efficient rendering model by incorporating compilation and specifically the reuse of the compiled code. This ultimately means a better experience for the end user.

#3 Scalability

Classic applications with ASP, components used by pages that are quite difficult to update, maintenance or replacement. In general information component in service implementation will require the closure of services IIS, replace the item, and then restart the IIS.

ASP.NET was built to provide specific enhancements that allow scalable and efficient application updating. The ‘xcopy’ deployment model of .NET allows replacement of pages and components in real time and does not require a restart of the web server. If an update needs to be made to a current production application, developers can simply make the change and the infrastructure can account for that change the next time a request is made to the altered page or component. This means that content updates, fixes and enhancements to ASP.NET applications can be made in real time with little to no impact to the user base.

#4 Language Support

ASP.NET supports full server side programming languages and not just scripting languages. Only VBScript and Javascript are available for scripting in ASP Classic where as, in ASP.NET there are no such restrictions. With ASP.NET several programming languages like C# and VB.NET are available to program in accordance to the developers preference where both of them can even be used in the same application. The benefits of using server side programming languages can be seen in the previously mentioned compilation of code and the fact that rich control sets and complex frameworks are available to applications. In summary, the language support of ASP.NET allows for the development of robust, feature rich applications with deep programmatic support.

ASP.NET for programmers, so that they can provide better products to end-users greater flexibility. There are many custom programming company specializing in ASP.NET for Web applications, desktop applications, and even mobile types of applications.