session variables problem

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Hi,

i have created module in vb.net which combine with the main application using asp classic...once i login and session variable just show in the default page but once i add or edit or back to first page the session was blank.
need advice and suggestion.

here my piece of code:

on page load

VB

UserID = Request.QueryString("userid")
       BranchID = Request.QueryString("branchid")
       Session("userid") = UserID
       Session("branchid") = BranchID
       Response.write(Session("userid") & "," & Session("branchid"))

on button event(for add new record)
Response.Redirect("WebForm1.aspx?userid=" & UserID & "&branchid=" & BranchID & "")

Thanks
Allesya

Posted 13-Jun-11 13:44pm

Reena Aleesya

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4 solutions

Solution 1

Hi,
When you click on your button, at first your page_load is called. but there is no correct querystring on postback! so you refill your sessions with empty!
change your code (page load) to this: ( I write c#, please change it to vb!)

if (!IsPostback)
{
   //your old code 
}
else
{
UserID=Session["userid"];
BranchID=Session["branchid"];
}

hope this can help.

Posted 13-Jun-11 14:48pm

aidin Tajadod

Comments

Reena Aleesya 13-Jun-11 21:43pm

hi aidin..thanks for suggestion..
i changed like your code..the session still blank..

If Not IsPostBack Then

'1. Create a connection

'2. Create the command object, passing in the SQL string

'3. Create the DataReader

Else
'Get the values of UserID and BranchID
UserID = Request.QueryString("userid")
BranchID = Request.QueryString("branchid")
Session("userid") = UserID
Session("branchid") = BranchID
Response.Write(Session("userid") & "," & Session("branchid"))
End If

rdgs
Aleesya

aidin Tajadod 14-Jun-11 17:47pm

Hi Aleesya, you need to Initialize sessions first.
If Not IsPostBack Then
Session("userid")=Request.QueryString("UserID)
...
Else
UserID=Session("userid");

you did exactly viceversa!
hope this can help.

Solution 2

You should do it like this

if(!Page.IsPostBack)
{
  if(Request.QueryString["userid"] == null || Request.QueryString["userid"] == "")
  {
     UserID=Session["userid"].ToString();
     if(Request.QueryString["userid"] == null || Request.QueryString["userid"] == "")
     {
         BranchID=Session["branchid"].ToString();
     }
  }
}

Above is the c# code, use the same logic in VB,net with correct syntax....

What's the problem : Whenever you login the page is first loaded, sets up the querystring value to the session.

But whenever a postback occur your codes assign querystring value to session which is empty now, fill ups the session again with the empty string.

So in above code I have checked and sets the session only once and next time a postback or full pageload occurs, if their is nothing in querystring it simply ignores the assignment.

Hope it helps ........ :)

Posted 13-Jun-11 19:21pm

Ra-one

Comments

Reena Aleesya 14-Jun-11 3:29am

hi rahul...thanks for your code..
once im replace into your code i got this error: object expected.
Im not sure where should i do.
Need your advice.
Thanks
Aleesya

aidin Tajadod 14-Jun-11 17:51pm

That code should be like this:
if (!Page.IsPostBack)
{
if (Request.QueryString["userid"]!=null && Request.QueryString["userid"]!="")
...
}

Reena Aleesya 15-Jun-11 2:47am

hi aidin..
i already retrieve the session variable...
but now i have another problem...once i'm click the menu or tab..the session will show blank...
need favor..
Thanks
Aleesya

aidin Tajadod 15-Jun-11 13:33pm

What kinds of menu/tab are you using?! did you correct your code at your page_load?! I can not tell you what is wrong unless you put your code here.

Reena Aleesya 15-Jun-11 19:46pm

hi aidin..
im modified your given code..
and finally i can display the session variable..
thanks buddy..next time i hope you can give me some advice..
rgds
Aleesya...

Solution 4

What page is your first page? and WebForm1.aspx and first page is the same or not?
I don't understand your workflow.
but you can refer following code:

'
' Session("userid") and Session("branchid")hove to Initialize in Global.asax file
If Not IsPostBack Then 
   UserID = Request.QueryString("userid")
   BranchID = Request.QueryString("branchid")
   Session("userid") = UserID
   Session("branchid") = BranchID
Else
   ' your code
   ' maybe   UserID = Session("userid") and BranchID = Session("branchid") 
End If

If your Sessions is blank, you should recheck userid and branchid at address bar, their value can blank
good lucky!

Posted 15-Jun-11 17:17pm

ngthtra

Updated 15-Jun-11 17:23pm

v2

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Reena Aleesya · Accepted Answer · 2011-06-15T13:46:00

If Request.QueryString("userid") = "" Or Request.QueryString("userid") Is Nothing Then
Session("userid") = Session("userid")
ElseIf Request.QueryString("branchid") = "" Or Request.QueryString("branchid") Is Nothing Then
Session("branchid") = Session("branchid")
Else
UserID = Request.QueryString("userid")
Session("userid") = UserID

BranchID = Request.QueryString("branchid")
Session("branchid") = BranchID
End If
Response.Write(Session("userid") & "," & Session("branchid"))