2. sanila.p
sanila222@gmail.com
www.facebook.com/username
twitter.com/sanila92
linkedin.com/sanila
session and cookies
get and post methods

3. Introduction
 Web appcation work on HTTPprotocol
HTTP protocol is a stateless protocol
It does not maintain the state between
requests

4. cookies
• A cookie is often used to identify a user.
• A cookie is a small file that the server embeds
on the user's computer.
• Common use of cookies is to remember users
between visits.

5. Uses of cookies
• Identification of a user session, user's
preferences.
• Cookies can also be used for travelling of data
from one page to another.
• Shopping cart contents
• Authentication

6. Ways of creating cookies

7. By using HttpCookies class
HttpCookie StudentCookies = new HttpCookie("StudentCookies");
StudentCookies.Value = TextBox1.Text;
StudentCookies.Expires = DateTime.Now.AddHours(1);
Response.Cookies.Add(StudentCookies);

8. By using Response directly
Response.Cookies["StudentCookies"].Value = TextBox1.Text;
Response.Cookies["StudentCookies"].ExpiresDateTime.Now.AddDays(1)
;

9. multiple values in same cookie
Response.Cookies["StudentCookies"]["RollNumber"] = TextBox1.Text;
Response.Cookies["StudentCookies"]["FirstName"] = "Anu";
Response.Cookies["StudentCookies"]["LastName"] = "Menon";
Response.Cookies["StudentCookies"].Expires =
DateTime.Now.AddDays(1);

10. How to Retrieve a Cookie Value?
For httpcookie class and response directly
method:
string val = Request.Cookies["StudentCookies"].Value;
For multiple cookies:
string val;
val = Request.Cookies["StudentCookies"]["RollNumber"];
val= val+ " " + Request.Cookies["StudentCookies"]["FirstName"];
val = val+ " " +Request.Cookies["StudentCookies"]["LastName"];
Label1.Text = val;

11. Example program:
protected void Page_Load(object sender, EventArgs e)
{
HttpCookie cookie = Request.Cookies["cookie"];
if (cookie == null)
{
HttpCookie userCookie = new HttpCookie("cookie");
userCookie["Name"] = "sanila";
userCookie.Expires = DateTime.Now.AddSeconds(8);
Response.Cookies.Add(userCookie);
Label1.Text = "Cookie created at: " + DateTime.Now.ToString() + "<br /><br />";
}
else
{
string name = cookie["Name"];
Label1.Text += "Welcome " + name;
}
}
demo

12. Deleting cookies
For deleting cookies:
if (Request.Cookies["StudentCookies"] != null)
{
Response.Cookies["StudentCookies"].Expires =
DateTime.Now.AddDays(-1);
}

13. session
Session serve the same purpose of cookies
that is sessions are used to maintain the state
in between requests

14. Creating session variable
Session["FirstName"] = TextBox.Text;
Session["LastName"] = TextBox1.Text;

15. How to receive session variable
if (Session["UserName"] != null)
{
label1.Text = "Welcome : " + Session[“username"];
}
else
{
label1.Text= “please check your username” ;
}

16. Destroying the session itself
• Session.clear(); //clears all the session
variables
• Session.Abandon(); //destroys the whole
session

17. Example program

18. Difference between session and
cookies
cookies session
cookies are stored in the user's browser Sessions are stored in server
A cookie can keep information in the user's
browser until deleted by user or set as per the
timer. It will not be destroyed even if you
close the browser.
A session is available as long as the browser is
opened. Usercant disable the session. It will
be destroyed if you close the browser
Cookies can only store string Can store any object
we can save cookie for future reference Session can’t be.

19. HTTP methods
HTTP methods is used for send the data from
client side to server side.
GET METHOD
POST METHOD

20. comparison
GET METHOD POST METHOD
Data will be arranged in HTTP header by
appending to the URL as query string
Data will be arranged in HTTP message body.
Data is in query string so user can view the
data
Data is not shown to user
Less secured compared to POST method
because data is in query string so it will be
saved in browser history and web server logs
safer than GET method because data is not
saved in history or web server logs.
As data is saved in URL so its saves only 2048
bytes data
We can used any amount of data and any
format
Hacking will be easy Hacking is difficult
Only ASCII character data type allowed No restrictions. Allows binary data also

21. 21
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

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