Session and cookies,get and post
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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.
![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);](https://image.slidesharecdn.com/sessionandcookiesgetandpost-140526085952-phpapp01/85/Session-and-cookies-get-and-post-9-320.jpg)
![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](https://image.slidesharecdn.com/sessionandcookiesgetandpost-140526085952-phpapp01/85/Session-and-cookies-get-and-post-10-320.jpg)
![Storing values To Session
• Use session Object
– Session["UserName"] = txtUser.Text;](https://image.slidesharecdn.com/sessionandcookiesgetandpost-140526085952-phpapp01/85/Session-and-cookies-get-and-post-15-320.jpg)
![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 }](https://image.slidesharecdn.com/sessionandcookiesgetandpost-140526085952-phpapp01/85/Session-and-cookies-get-and-post-16-320.jpg)
Session and cookies,get and post
- 2. MuhammedAjmalI K mhdajmalik@gmail.com www.facebook.com/ajuik2008 twitter.com/mhdajmalik in.linkedin.com/in/profilename 9745020951 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"); }
- 26. Thank You
- 27. Want to learn more about programming or Looking to become a good programmer? Are you wasting time on searching so many contents online? Do you want to learn things quickly? Tired of spending huge amount of money to become a Software professional? Do an online course @ baabtra.com We put industry standards to practice. Our structured, activity based courses are so designed to make a quick, good software professional out of anybody who holds a passion for coding.
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