Session object is null on IIS ASP.NET

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I have a web application. I stored user information to session. It is ok when I deploy it on IIS as a website. But when I deploy it on IIS as an application of Default Website, the session object is always null.
It's run under the .NET v4.5 Application pool. My IIS version is 8.0. Why Session Object is null on IIS? I'm stuck on this issue.

Thanks.

What I have tried:

public int GetUserId()
{
int userId = 0;

var userObj = (Models.User)Session["user"];

if (userObj != null)
{
userId = userObj.UserId;
}
return userId;
}

userObj is null and return userId as 0.

Posted 30-May-16 21:50pm

Zan Zan Koe

Updated 30-May-16 22:43pm

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Afzaal Ahmad Zeeshan · Answer 1 · 2016-05-30T22:43:00

You did not share the code to set the value for the session variable. Did you do this?

C#

// Create a new user and save it
Session["user"] = new User();

// Access the value here

If you did this before getting the value, only then you can get the value back from the session. This is exactly why it is recommended to use a conditional-block around the statements where you try to get the values. Also, Session variables can be removed programmatically, make sure your application is not refreshing the variables. If it is, please remove those statements. Session.Clear() etc. such functions are meant to clear the values once they are no longer needed, before the session expires.

For more discussion and overviews please read: ASP.NET Session State Overview[^]
HttpContext.Session Property (System.Web)[^]
.net - C# Clear Session - Stack Overflow[^]