This document provides an overview of session and cookies, GET and POST methods for state management in web applications. It defines cookies as small text files stored on the client-side that can send data between web forms. Sessions store data on the server-side per user and have a default 20 minute lifetime. GET requests encode data in the URL while POST sends it in the HTTP body. Form data is typically sent via POST if large, while GET is used by default.

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Session and Cookies,
Get and Post

3. Disclaimer: This presentation is prepared by trainees of
baabtra as a part of mentoring program. This is not official
document of baabtra –Mentoring Partner
Baabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt . Ltd

4. Overview
• Introduction
• State Management
• Cookie
• Session
• Get
• Post

5. Introduction
• Web Pages developed in ASP.Net are HTTP based
and HTTP protocol is a stateless protocol.

6. State Management
• It is the process by which you maintain state and page
information over multiple requests for the same or
different pages.
• Two type State Management
1. Client side State Management
Data can be stored at client side.
Ex: View state, Cookies , Query strings.
2. Server side State Management
Data can be stored at Server side.
Ex: Session state.

7. Cookie

8. Introduction
• Cookies are the small text files that are stored on
client side.
• It is used for state management.
• Used to send data from one webform to another.

9. How to create Cookies
Step 1: Create the cookie object
HttpCookie cookie = new HttpCookie("UserDetails");
Step 2: store value into cookie
cookie["Name"] = txtName.Text;
cookie["Email"] = txtEmail.Text;
Step 3: Add the cookie to the client machine
Response.Cookies.Add(cookie);

10. How to read data from Cookies
Step 1: Retrieve Cookie
HttpCookie cookie = Request.Cookies["UserDetails"];
Step 2: check whether a cookie was found or not.
if (cookie != null)
{
lblName.Text = cookie["Name"];
lblEmail.Text = cookie["Email"];
}
EXAMPLE

11. Types Of Cookie
• Cookies can be broadly classified into 2 types
1. Non-Persistent cookies
• Temporary Cookies.
• Remain in memory until the browser is closed.
2. Persistent cookies
• permanent cookies
• Remain on the client computer, even after the browser
is closed.

12. How to make persistent Cookies?
• persistent cookies should have an expatriation time
defined.
– cookie.Expires = DateTime.Now.AddDays(30);

13. Advantages and Disadvantages
of Cookies
• Advantages
– It's very simple to use and implement.
– Browser takes care of sending the data.
• Disadvantages
– It stores data in simple text format, so it's not
secure at all.
– There is a size limit for cookies data (4KB).

14. Session
• Session state variables are stored on the web server
• Session state is maintained per user basis in ASP .Net
runtime.
• Default life time is 20 minute.

15. Storing values To Session
• Use session Object
– Session["UserName"] = txtUser.Text;

16. Retrieving values From Session
 Check weather session variable null or not
if (Session["UserName"] != null)
{
// Retrieving UserName from Session
lblWelcome.Text = "Welcome : " + Session["UserName"];
}
else
{ //Do Something }

17. Advantages and Disadvantages
of Session
• Advantages
– Stores client data separately.
– Session is secure and transparent from the user.
• Disadvantages
– Performance overhead

18. Get and Post

19. Hypertext Transfer Protocol
• Http is the most common protocol used for
communication between a web server and a client.
• The 2 most commonly used HTTP methods are
1. GET
2. POST.

20. GET Request
• the data being sent to your server is coded into the
URL.

21. POST Request
• Data will be arranged in HTTP message body.

22. where it is?
• <form method="get||post">
• By default Get method are used
• If the form data is large then best is use POST
• By default the form with runat="server", will
have method="post“
•

23. where it is? Contd..
• the first request of that page: Request is a GET
type .
• In postback: Request is a POST type

24. Difference between GET and POST
method

25. Example Programs….
if(Request.RequestType=="GET")
{
Response.Write("Request is a GET type");
}
else if(Request.RequestType=="POST")
{
Response.Write("Request is a POST type");
}

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