Redirect to login page after session timeout

Question

I have found some similar questions but none gave me what I really need.

Here is the thing, I have added this to my web.config to handle user session expiration:

<sessionState mode="InProc" timeout="1" />

After 1 minute, the Session_End event from Global.asax is raised:

Sub Session_End(ByVal sender As Object, ByVal e As EventArgs)
    Response.Redirect("Login.aspx")
End Sub

This doesn't work, because:

Response is not available in this context.

(By the way, this question got an anwswer telling that this is ok and it got upvotes).

I don't want nothing fancy. I just want a simple way to redirect the user to the login page when the session time expires. That's all.

Thank you.

Answer 1

Session_End is a server-side event, meaning it is triggered on the web server and has nothing to do with a request by the client. This is why the Request is unavailable.

You have two choices in this matter:

1. On each client request, check if a specific Session variable is set. If it is not, it means the previous Session has expired and the new Session must be populated. (I am assuming this is why you want to check for Session expiration)

2. Have a javascript call on the client that periodically goes back to the server to check if the Session is still valid. If the Session has expired, you can redirect the user to the login page.

samples of different redirect methods

location.href = "login.aspx";
// or you can use 
location.assign("login.aspx");
//for redirecting without storing in history
location.replace("login.aspx")

Don't forget to add ?ReturnUrl=[current url] to the login redirect path.

HTH