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However, there needs to be some technique to store the information between requests and to retrieve it when required.

This information i.e., the current value of all the controls and variables for the current user in the current session is called the State. NET manages four types of states: The view state is the state of the page and all its controls.

It is automatically maintained across posts by the ASP. When a page is sent back to the client, the changes in the properties of the page and its controls are determined, and stored in the value of a hidden input field named _VIEWSTATE.

When the page is again posted back, the _VIEWSTATE field is sent to the server with the HTTP request.

Download source code for 3-Tier Architecture in ASP. Seperation - the functionality is seperated from the data access and presentation so that it is more maintainable 2.

NET with C# 3-Tier architecture generally contains UI or Presentation Layer, Business Access Layer (BAL) or Business Logic Layer and Data Access Layer (DAL). Independence - layers are established so that if one is modified (to some extent) it will not affect other layers. Reusability - As the layers are seperated, it can exist as a module that can be reused by other application by referencing it.

The State Bag class has the following properties: The following example demonstrates the concept of storing view state. When session state is turned on, a new session state object is created for each new request.

Let us keep a counter, which is incremented each time the page is posted back by clicking a button on the page. The markup file code is as follows: It would produce the following result: Control state cannot be modified, accessed directly, or disabled. This session state object becomes part of the context and it is available through the page.

You cannot prevent that kind of problems by validating input.You can use a asp regex validator to confirm input, just ensure you wrap your code behind method with a if(Is Valid) clause in case your javascript is bypassed. If your client javascript is bypassed and script tags are posted to your form, will throw a unhandled exception. Presentation Layer (UI) Presentation layer cotains pages like or windows form where data is presented to the user or input is taken from the user. Hope this article helped you understanding 3-Tier architecture and desiging it. Updated on July 01 2008: Source Code attached Full Name: Sheo Narayan Member Level: Honorary Platinum Member Status: Administrator Member Since: 7/8/2008 PMCountry: India Regards, Sheo Narayan MVP, Author, Writer, Mentor & architecting applications since year 2001.Business Access Layer (BAL) or Business Logic Layer BAL contains business logic, validations or calculations related with the data, if needed. Data Access Layer (DAL) DAL contains methods that helps business layer to connect the data and perform required action, might be returning data or manipulating data (insert, update, delete etc). Connect me on | https://twitter.com/sheonarayan | Hi, Nice article; Well and simply explained.

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