ASP.NET Session State
ASP.NET session state solves all of the above problems associated with classic ASP session state:
* Process independent. ASP.NET session state is able to run in a separate process from the ASP.NET host process. If session state is in a separate process, the ASP.NET process can come and go while the session state process remains available. Of course, you can still use session state in process similar to classic ASP, too.
* Support for server farm configurations. By moving to an out-of-process model, ASP.NET also solves the server farm problem. The new out-of-process model allows all servers in the farm to share a session state process. You can implement this by changing the ASP.NET configuration to point to a common server.
* Cookie independent. Although solutions to the problem of cookieless state management do exist for classic ASP, they're not trivial to implement. ASP.NET, on the other hand, reduces the complexities of cookieless session state to a simple configuration setting.
asp.net interview questions on cookie
The cookie object is the essence of any interview, be it ASP NET interview or Java interview or PHP interview.
Cookie - A cookie is a piece of data that is stored on a user's browser. Thus, a cookie does not use any server memory. It is actually a small text file which is created by the broswer on the hard disk of the user. It is actually a piece of information in the form of text strings. A web server sends a cookie to a user (client browser) and then the browser stores it.
A cookie is used to store information of a user & information about a user's preferences. How does the cookie works? - When a user visits a site, say www.amazon.com, and creates a profile out there, the server sends an ID (basically an ID to track this user) and saves the ID through the user's browser in the form of a cookie on the user's system. When the user revisits this site, the website tracks the user's system for the existence of any cookie, and in case it finds a cookie, it customizes the site based on the user's settings and preferences.
Now lets talk about how to create a cookie in ASP.NET. It is pretty simple. There is a class in the System.Web namespace by the name HttpCookie. This class may be used to easily create a cookie on the user's system. Below is a code sample on how to use a cookie in ASP.NET ...
//Creating a cookie HttpCookie sampleCookie = new HttpCookie("UserColorSetting");
sampleCookie.Values.Add("Background", txtBackgroundColor.Text);
sampleCookie.Expires = #12/31/2010#; Response.Cookies.Add(sampleCookie);
//Getting a cookie value from the user's computer
String sGetCookie;
sGetCookie = Request.Cookies("UserColorSetting")("Background").ToString();
Limitations of Cookies - Cookies are meant for infrequent storage of small pieces of information. They are not meant as a normal communication or mechanism. Note that web browsers are not required to save more than 300 cookies total, nor more than 20 cookies per web server (for the entire server, not just for the page or site on the server), nor to retain more than 4 kilobytes of data per cookie (both name and value count towards this 4 kilobyte limit). The biggest limitation of these is the 20 cookies per server limit, and so it is not a good idea to use a different cookie for each variable that has to be saved. Rather save a single cookie containing a lot of information.
asp.net interview: creating a cookie from source using c#
protected void Page_Load(object sender, EventArgs e)
{
HttpCookie cookie = Request.Cookies["maid"];
if (cookie == null)
{
cookie = new HttpCookie("maid");
}
cookie["id"] = "123";
cookie.Expires = DateTime.Now.AddMinutes(10);
Response.Cookies.Add(cookie);
}
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