How to use session events and timeout in ASP.NET?

Basically a Session is having two types of events. That are

1: Session_Start

void Session_Start(object sender, EventArgs ee) 
 {
       // This set of code will execute when the session starts.
 }

2: Session_End

void Session_End(object sender, EventArgs ee) 
 {
       // This set of code will execute when the session ends. 
 }

You can also set the TimeOut for a Session. That is

Session.TimeOut=50;

Here the Session will keep your session value for 50 minutes, after that it will automatically clear the session value.