There are two types of session events available in ASP.NET:

  • Session_Start
  • Session_End
You can handle both these events in the global.asax file of your web application. When a new session initiates, the session_start event is raised, and the Session_End event raised when a session is abandoned or expires.

We know that Http is stateless, means when we open a webpage and fill some information and then move to next page then the data which we have entered will lost.It happed do to Http protocol stateless nature. So here session come into existence, Session provide us the way of storing data in server memory. So you can store your page data into server memory and retrieve it back during page postbacks.

Stateless protocol is a communications protocol that treats each request as an independent transaction that is unrelated to any previous request so that the communication consists of independent pairs of requests and responses.

State management is the process by which you maintain state and page information over multiple requests for the same or different pages.


  • Session provide us the way of maintain user state/data.
  • It is very easy to implement.
  • One big advantage of session is that we can store any kind of object in it. eg, datatable, dataset etc
  • By using session we do not need to worry about data collapsed, because it store every client data separately.
  • Session is secure and transparent from the user.
  • Performance overhead in case of large volumes of data/user, because session data is stored in server memory.
  • Overhead involved in serializing and de-serializing session data, because in the case of StateServer and SQLServer session modes, we need to serialize the objects before storing them.

System.Object is the top .NET class that everything is derived from.
We use untrusted verification because web Services might use it, as well as non-windows applications. 

The advantages of Ado.Net  are-

  • ADO.NET does not depend on continuously live connections 
  • Database interactions are performed using data commands 
  • Data can be cached in datasets 
  • Datasets are independent of data sources 
  • Data is persisted as xml 
  • Schemas define data structures

We need to serialize the object, if you want to pass object from one computer/application domain to another. Process of converting complex objects into stream of bytes that can be persisted or transported. Namespace for serialization is System.Runtime.Serialization. The ISerializable interface allows you to make any class Serializable. .Net framework provides two serialization method-

  1. Binary Serialization 
  2. XML Serialization

Globalization is the process of creating an application that meets the needs of users from multiple cultures. It includes using the correct currency, date and time format, calendar, writing direction, sorting rules, and other issues. Accommodating these cultural differences in an application is called localization. Using classes of System.Globalization namespace, you can set applications current culture.
This can be achieved by using any of the following 3 approaches-

  • Detect and redirect.
  • Run-time adjustment.
  • Using Satellite assemblies.

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