Question

I have created a class file in the App_Code folder in my application. I have a session variable

Session['loginId'] 

I want to access this session variables in my class, but when I am writing the following line then it gives error

Session['loginId'] 

Can anyone tell me how to access session variables within a class which is created in app_code folder in ASP.NET 2.0 (C#)

Answer 1

(Updated for completeness)
You can access session variables from any page or control using Session['loginId'] and from any class (e.g. from inside a class library), using System.Web.HttpContext.Current.Session['loginId'].

But please read on for my original answer…

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I always use a wrapper class around the ASP.NET session to simplify access to session variables:

public class MySession {     // private constructor     private MySession()     {       Property1 = 'default value';     }      // Gets the current session.     public static MySession Current     {       get       {         MySession session =           (MySession)HttpContext.Current.Session['__MySession__'];         if (session == null)         {           session = new MySession();           HttpContext.Current.Session['__MySession__'] = session;         }         return session;       }     }      // **** add your session properties here, e.g like this:     public string Property1 { get; set; }     public DateTime MyDate { get; set; }     public int LoginId { get; set; } } 

This class stores one instance of itself in the ASP.NET session and allows you to access your session properties in a type-safe way from any class, e.g like this:

int loginId = MySession.Current.LoginId;  string property1 = MySession.Current.Property1; MySession.Current.Property1 = newValue;  DateTime myDate = MySession.Current.MyDate; MySession.Current.MyDate = DateTime.Now; 

This approach has several advantages:

• it saves you from a lot of type-casting
• you don’t have to use hard-coded session keys throughout your application (e.g. Session[‘loginId’]
• you can document your session items by adding XML doc comments on the properties of MySession
• you can initialize your session variables with default values (e.g. assuring they are not null)