Passing Session variable into c#


I'm not very familiar with c# but I'm trying to pass a session variable into a c# page abd having problem,

I'm guessing it's something with the private code block

the variable sets in login

 Context.Session("aspnetforumUserNickName") = "Administrator"

and when I try to load the c# page I  get this error

Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:

Line 112:                        {
Line 113:                            //username = Session["aspnetforumUserName"].ToString();
Line 114:                            username = Session["aspnetforumUserNickName"].ToString();
Line 115:
Line 116:                        }

any help would be appreciated

protected void Page_PreRender(object sender, EventArgs e)
            cmd.Connection = cn;

            //if (lblVersion != null)
             //   string dllversion = System.Reflection.Assembly.GetExecutingAssembly().GetName().Version.ToString();
            //    lblVersion.Text = dllversion;

            bool integratedAuthEnabled = Utils.Settings.IntegratedAuthentication;
            //bool isForumPage = (Page is ForumPage);

            if (isForumPage)
                if (CurrentUserID == 0) //not logged in
                    //if (registerLink != null) registerLink.Visible = !integratedAuthEnabled;
                    if (logoutLink != null) logoutLink.Visible = false;
                    if (viewProfileLink != null) viewProfileLink.Visible = false;
                    if (loginTable != null) loginTable.Visible = !integratedAuthEnabled && ShowLoginTable;
                    if (curuserTable != null) curuserTable.Visible = false;
                    if (usersLink != null) usersLink.Visible = false;
                    if (aOpenId != null) aOpenId.Visible = Utils.Settings.EnableOpenId;
                else //logged in
                    //if (registerLink != null) registerLink.Visible = false;
                    //if (logoutLink != null) logoutLink.Visible = !integratedAuthEnabled;
                    if (loginTable != null) loginTable.Visible = false;
                    if (curuserTable != null) curuserTable.Visible = ShowLoginTable;
                    if (usersLink != null) usersLink.Visible = true;
                    //if (editProfileHeaderLink != null) editProfileHeaderLink.Visible = true;

                    if (viewProfileLink != null)
                        viewProfileLink.Visible = true;
                        string username;
                        //IF "integrated auth" is enabled
                        //AND it is windows-authenctication
                        //then lets remove tha domain name from "domain\user" username
                        if (Page.User is System.Security.Principal.WindowsPrincipal
                            && Utils.Settings.IntegratedAuthentication)
                            username = Session["aspnetforumUserName"].ToString();
                            username = username.Substring(username.IndexOf("\\") + 1);
                            //username = Session["aspnetforumUserName"].ToString();
                            username = Session["aspnetforumUserNickName"].ToString();

                        viewProfileLink.InnerHtml = username;

                    int unreadPrivateMsgs = GetUnreadPersonalMessagesCount();
                    string avatarPath = GetCurrUserAvatarImagePath();

                    if (imgAvatar != null) imgAvatar.Src = avatarPath;
                    if (spanNumMsgs != null)
                        spanNumMsgs.InnerHtml = unreadPrivateMsgs.ToString();
                        if (unreadPrivateMsgs > 0) spanNumMsgs.Style["font-weight"] = "bold";
                    if (spanNumUnreadThreads != null)
                        int updatedTopics = GetUpdatedThreadCount();
                        if (updatedTopics > 0)
                            spanNumUnreadThreads.InnerHtml = "(" + updatedTopics + ")";

            adminLink.Visible = isForumPage && IsAdministrator && adminLink != null;
            moderLink.Visible = isForumPage && IsModerator && moderLink != null;

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Who is Participating?
Pratima PharandeConnect With a Mentor Commented:
check the condition like this

if ( Session["aspnetforumUserNickName"] !=  null )
                                                       username = Session["aspnetforumUserNickName"].ToString();

if its null means session isnot set properly                                       }
Pratima PharandeCommented:
Insert the data to session like this

Session["aspnetforumUserNickName"] = "Administrator"
TheWebGuy38Author Commented:
this is my vb code setting the session. I'm pretty sure it's correct

 Context.Session("aspnetforumUserID") = AspnetforumUserID
                        Context.Session("aspnetforumUserName") = Dr("UserName")
                        Context.Session("aspnetforumUserNickName") = "Administrator"

is there an issue going from vb to c?
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TheWebGuy38Author Commented:
Very strange.

I added this like you said

         username = Session["aspnetforumUserNickName"].ToString();
                            if ( Session["aspnetforumUserNickName"] !=  null )
                                                      username = Session["aspnetforumUserNickName"].ToString();

and it passed the variable
Todd GerbertIT ConsultantCommented:
How do your VB code and C# code relate to each other...i.e. is the VB code an HttpHandler, and the C# code the website - or do you have two different websites?

I'm also pretty sure your VB code is correct, but I'm also pretty sure checking for null before attempting to read the session variable has no effect on the exception you've cited. Which means either A) It was always working (and was just a rare condition/glitch that threw the exception in the first place) or B) It's not working now (and your test worked because, perhaps, of a condition unique to the debugging environment).
Pratima PharandeCommented:
ok your Vb cod is right ?

is this are two differnt applications then I don't think you can share session like this

you can try to store the Session object in the database, that's easy to pass the Session object to other application
TheWebGuy38Author Commented:
It seems to be working now.

I coded my site in .vb, but then I purchased a forum app that I integrated into the site that is c#
I know, a little messy, but it works
Pratima PharandeCommented:
ok thats good
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