Session variables not set until second time page is hit

[belle9]

I'm trying to access a session variable. It loses its value the first time I hit a page, but if I hit that page twice before doing anything(click the same link twice), it works.

So, page default.aspx, has the below code:

 Session("ProdID") = ProdID
 Response.Redirect("/pages/Products.aspx")

If I start at default.aspx and click on the image that calls the above code, when it redirects ProdID is NOTHING. However, if when I start at default.aspx, and I reload it by clicking a link that directs right back to itself, ProdID is the right value when redirected. It seems somehow I have to hit the page twice to load up the session...DOes that make any sense?

 

[checkai]

Post your code for the button and your page load

"...we both know I'm training to become a cagefighter...see what happens if you try 'n hit me..."

 

[belle9]

Here it is, the originating page:

 Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        myConnection = New SqlConnection(conString)
        myConnection.Open()
        Dim bottleshot As String
        mycommand = New SqlCommand("getDefaultProducts", myConnection)
        mycommand.CommandType = CommandType.StoredProcedure

        myReader = mycommand.ExecuteReader

        While myReader.Read
            bottleshot = myReader.Item("defaultImagePath")
            dlDefaultProducts.DataSource = myReader
            dlDefaultProducts.DataBind()

        End While

        myConnection.Close()

    End Sub

    Public Sub btnDefaultProd_Clicked(ByVal sender As Object, ByVal e As System.Web.UI.ImageClickEventArgs)

        Dim objButton As ImageButton
        objButton = CType(sender, ImageButton)
        Dim ProdID As String = CType(sender, ImageButton).CommandArgument
        Session("ProdID") = ProdID
        Response.Redirect("/pages/Products.aspx?prodid=3")

    End Sub

Here's the image:

	<asp:imagebutton id=btnDefaultProd onclick=btnDefaultProd_Clicked ImageUrl='<%#Container.DataItem("defaultImagePath")%>' CommandArgument='<%# Container.DataItem("productsID") %>' Runat="server" ImageAlign="Top">
									</asp:imagebutton>

 

[checkai]

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
if not page.ispostback then
        myConnection = New SqlConnection(conString)
        myConnection.Open()
        Dim bottleshot As String
        mycommand = New SqlCommand("getDefaultProducts", myConnection)
        mycommand.CommandType = CommandType.StoredProcedure

        myReader = mycommand.ExecuteReader

        While myReader.Read
            bottleshot = myReader.Item("defaultImagePath")
            dlDefaultProducts.DataSource = myReader
            dlDefaultProducts.DataBind()

        End While

        myConnection.Close()
end if
    End Sub

try adding this if not page.ispostback statement.

"...we both know I'm training to become a cagefighter...see what happens if you try 'n hit me..."

 

[belle9]

That didn't help..

 

[belle9]

Anyone? Any ideas?? This is really aggravating me.

 

[JohnYingling]

I do not believe that Redirect carries Session State with it because it can go to any site, not jut this application. See Server.Transfer.

http://www.moldyoldy.com/VBComparedemo

- free online Compare/Diff of snippets

 

[belle9]

But it works the second time the page is hit, just not the very first time. Wouldn't that mean it does work?

I'll try server.transfer..

 

[belle9]

server.transfer causes other things to mess up..

This:

<%@ Register TagPrefix="uc1" TagName="header" Src="/includes/header.ascx" %>

gives this error:
"The virtual path '/includes/header.ascx' maps to another application, which is not allowed.

 

[jshurst]

I think this is because the page_load fires first no matter what. Your session has not been set because of the order, page_load -> button_click (where your session is).

I am having this problem too, but I think that is where the problem lies.

Also response.redirect does carry a session state.

I am trying to upload a picture to a server with a button click. Then after the picture is uploaded I want it to be displayed. Check out this page if you are interested.

http://msdn.microsoft.com/canada/btl/jan_winner3.asp