Simple question about code

It's saying redirect to the UserDetails page and pass in a query string [^] with a name of 'Id' and the value is retrieved from the Session.


Basically, when the UserDetails page loads, it will be able to retrieve the Id passed to it and load up the User that matches the Id.

1. The Redirect method causes the browser to redirect the client to a different URL.

2. In short anything after ? will be categorized into query string as name and value. There can be multiple query string. In this case ID is the first one.

for detailed understanding of URL you can go through URL Specification[^]

As others have explained, ID in this case refers to the Session variable, and to the query string. Now, you may be asking yourself why the user would need to pass the variable across - after all, you already have it in the session, so the page being redirected to (which belongs to the same site) should be able to pick that up.

The answer is because a session is volatile. In other words, you have no guarantee that the session will continue to be there when the redirect completes. This is a fairly naive piece of code, because it also assumes that the session value is there when the call is issued - there's no guarantee that this is true; if a page has been left sitting unattended for a long period of time, the session could well have been recycled.

Hi
Starting First Stage:- Session["Id"].ToString());

This is using for maintain session in your application.

Firstly you check where id exists as paramerter in your application

Like ID=10;

session["id"]=id;
now session[10]

Response.Redirect("~/UserDetails.aspx?Id=" + Session["Id"].ToString());

on your explorer you see "userdetails.aspx?id=10"

this is basically used for one page value send to another page...

Thanks