How to get session value in class anywhere ?

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Hello guys. I have some sessions in ASP.net as follow . In file Test.aspx.cs have some session

C#

HttpContext.Current.Session["Id"] = obj.USER_MOD_ID;
HttpContext.Current.Session["Group"] = obj.GROUP_MOD_ID;
HttpContext.Current.Session["Region"] = obj.REGION_ID;

And then i create some class , I want to get value of session.

First , i create a class MySession.cs

C#

public class MySession
   {
       // private constructor
       private MySession()
       {
           value_group = "Group";
           //value_id = "Id";
           //value_region = "Region";
       }
       // Gets the current session.
       public static MySession Current
       {
           get
           {
               MySession session =(MySession)HttpContext.Current.Session["Group"];
               if (session == null)
               {
                   session = new MySession();
                   HttpContext.Current.Session["Group"] = session;
               }
               return session;
           }
       }
       // **** add your session properties here, e.g like this:
       public string value_group { get; set; }
       //public string value_id { get; set; }
       //public string value_region { get; set; }
   }

Second, i create class Test.cs and i want get value of session

C#

string value_group = MySession.Current.value_group.ToString();
               //string value_id = MySession.Current.value_id.ToString();
               //string value_region = MySession.Current.value_region.ToString();

But it's get error

C#

Object reference not set to an instance of an object

Thank guys.

Posted 3-Jun-15 17:29pm

headshot9x

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2 solutions

Solution 1

C#

MySession session = (MySession)HttpContext.Current.Session["Group"];

This casting is the issue.
Try using this instead:

C#

MySession session = HttpContext.Current.Session["Group"] as MySession;

Posted 3-Jun-15 17:53pm

InbarBarkai

Comments

headshot9x 4-Jun-15 0:07am

I don't understand the other session where values , Id and Region ? and I try but it's not work.

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DamithSL · Accepted Answer · 2015-06-03T17:58:00

if the Current is returning session instant, change the code as below

C#

public class MySession
   {
       // private constructor
       private MySession()
       {
           Group= "Initial Group 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;
           }
       }

       public string Group { get; set; }

   }

then you need to access session value as

C#

string value_group = MySession.Current.Group;