ASP.NET-Web Programming - Sessions and Cookies
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Cookies and sessions allow web applications to maintain state between HTTP requests. Cookies are small pieces of textual data stored in the user's browser, while sessions are stored on the server. Cookies can store a limited amount of data but are accessible across browser sessions, while sessions can store more complex objects but are only accessible while the user's browser is open. The document provides code examples for creating, accessing, and destroying both cookies and sessions in ASP.NET applications.
![Creating cookie
C#
• Response.Cookies*"cookie“+ = "cookie value";
Response.Cookies["cookie"].Expires = DateTime.Now.AddMinutes(10); //
add expiry time
VB.net
• Response.Cookies("cookie“) = "cookie value”
Response.Cookies("cookie“).Expires = DateTime.Now.AddMinutes(10) //
add expiry time
• This simply sets a cookie variable named “cookie” with value
“cookie value” and this variable value will be available till next 10
minutes from current time](https://image.slidesharecdn.com/aspnet-day-2webprogramming-sessionsandcookies-140422115647-phpapp02/85/ASP-NET-Web-Programming-Sessions-and-Cookies-4-320.jpg)
![Accessing Cookies
C#
• Request.Cookies*"cookie“+ = "cookie value";
VB.net
• Request.Cookies("cookie“) = "cookie value";
Cookie as array
C#
• Response.Cookies["UserSettings"]["Font"] = "Arial";
• Response.Cookies["UserSettings"]["Color"] = "Blue";
• Response.Cookies["UserSettings"].Expires = DateTime.Now.AddDays(1d);](https://image.slidesharecdn.com/aspnet-day-2webprogramming-sessionsandcookies-140422115647-phpapp02/85/ASP-NET-Web-Programming-Sessions-and-Cookies-5-320.jpg)
![Destroying Cookies
• You cannot directly delete a cookie on a user's computer. However, you can
direct the user's browser to delete the cookie by setting the cookie's expiration
date to a past date. The next time a user makes a request to a page within the
domain or path that set the cookie, the browser will determine that the cookie
has expired and remove it.
• C#
if (Request.Cookies["UserSettings"] != null)
{
HttpCookie myCookie = new HttpCookie("UserSettings");
myCookie.Expires = DateTime.Now.AddDays(-1d);
Response.Cookies.Add(myCookie);
}](https://image.slidesharecdn.com/aspnet-day-2webprogramming-sessionsandcookies-140422115647-phpapp02/85/ASP-NET-Web-Programming-Sessions-and-Cookies-7-320.jpg)
![Creating session variables
C#
Session["FirstName"] = FirstNameTextBox.Text;
Session["LastName"] = LastNameTextBox.Text;
VB.net
Session("FirstName") = FirstNameTextBox.Text
Session("LastName") = LastNameTextBox.Text
Any .net framework object type can be stored in a session variable](https://image.slidesharecdn.com/aspnet-day-2webprogramming-sessionsandcookies-140422115647-phpapp02/85/ASP-NET-Web-Programming-Sessions-and-Cookies-12-320.jpg)
ASP.NET-Web Programming - Sessions and Cookies
- 1. Introduction to ASP.net Web programming Week 11, day2
- 2. Cookies
- 3. Cookies • HTTP is a stateless protocol; this means that the web server does not know (or care) whether two requests comes from the same user or not; it just handles each request without regard to the context in which it happens. • Cookies are used to maintain the state in between requests—even when they occur at large time intervals from each other. • Cookies allow your applications to store a small amount of textual data (typically,4-6kB) on a Web client browser. • There are a number of possible uses for cookies, although their most common one is maintaining state of a user
- 4. Creating cookie C# • Response.Cookies*"cookie“+ = "cookie value"; Response.Cookies["cookie"].Expires = DateTime.Now.AddMinutes(10); // add expiry time VB.net • Response.Cookies("cookie“) = "cookie value” Response.Cookies("cookie“).Expires = DateTime.Now.AddMinutes(10) // add expiry time • This simply sets a cookie variable named “cookie” with value “cookie value” and this variable value will be available till next 10 minutes from current time
- 5. Accessing Cookies C# • Request.Cookies*"cookie“+ = "cookie value"; VB.net • Request.Cookies("cookie“) = "cookie value"; Cookie as array C# • Response.Cookies["UserSettings"]["Font"] = "Arial"; • Response.Cookies["UserSettings"]["Color"] = "Blue"; • Response.Cookies["UserSettings"].Expires = DateTime.Now.AddDays(1d);
- 6. Cookie as array Cookie as array VB.net • Response.Cookies("UserSettings")("Font") = "Arial" • Response.Cookies("UserSettings")("Color") = "Blue" • Response.Cookies("UserSettings").Expires = DateTime.Now.AddDays(1)
- 7. Destroying Cookies • You cannot directly delete a cookie on a user's computer. However, you can direct the user's browser to delete the cookie by setting the cookie's expiration date to a past date. The next time a user makes a request to a page within the domain or path that set the cookie, the browser will determine that the cookie has expired and remove it. • C# if (Request.Cookies["UserSettings"] != null) { HttpCookie myCookie = new HttpCookie("UserSettings"); myCookie.Expires = DateTime.Now.AddDays(-1d); Response.Cookies.Add(myCookie); }
- 8. Destroying Cookies • VB.net If (Not Request.Cookies("UserSettings") Is Nothing) Then Dim myCookie As HttpCookie myCookie = New HttpCookie("UserSettings") myCookie.Expires = DateTime.Now.AddDays(-1D) Response.Cookies.Add(myCookie) End If
- 9. Sessions
- 10. Sessions • Session serve the same purpose of cookies that is sessions are used to maintain the state in between requests • The difference of session variables with cookies is that they are stored in the server while cookie variables are stored on the client (browser) • In asp.net a session gets started when the user starts interacting with the server, that is when the user first accesses a page from the application • Session can be used to store values as session variables which will be available throughout the session
- 11. Sessions • Session can support any type of object to store along with our own custom objects • For every client, session data is stored separately, which means session data is stored on a per client basis
- 12. Creating session variables C# Session["FirstName"] = FirstNameTextBox.Text; Session["LastName"] = LastNameTextBox.Text; VB.net Session("FirstName") = FirstNameTextBox.Text Session("LastName") = LastNameTextBox.Text Any .net framework object type can be stored in a session variable
- 13. Destroying a session variable C# Session.Remove("FirstName”); Session.Remove("LastName“); VB.net SessionRemove ("FirstName") SessionRemove ("LastName")
- 14. Destroying the session itself C# Session.clear(); //clears all the session variables Session.Abandon(); //destroys the whole session VB.net Session.clear(); //clears all the session variables Session.Abandon(); //destroys the whole session
- 15. Comparison cookies are stored in the user's browser 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. Cookies can only store string we can save cookie for future reference Sessions are stored in server A session is available as long as the browser is opened. User cant disable the session. It will be destroyed if you close the browser Can store any object session can’t be. Cookies Session
- 16. End of Day
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