Can't get session variable...

Hello again!

I've been trying to put up a shopping cart with a items list page and a second one (cart). When I hit the "buy" button from one item I get this error on "cart.aspx":

"Object reference not set to an instance of an object"

Line 5: Dim ds as DataSet Line 6: ds = CType(Session("myDataSet"), Dataset) Line 7: MyDataGrid.Datasource=ds.Tables("Catalogo").DefaultView Line 8: MyDataGrid.DataBind() Line 9: End Sub

 I have no clu where the error may come from so I'm gonna post both entire files code.

item list.aspx 

[HTML]

<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.OleDB" %>
   <%@ Page Language="VB" Debug="true" %>
<html>

<script language="VB" runat="server">

    Dim MyConnection As OleDBConnection

    Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs)
    If Not Page.IsPostBack() Then
     DataBind()
    dlsearchby.items.Add("produto")

    End If
    End Sub

    Private Sub DataBind()

     DIM MyConnection As New OleDBConnection("Provider=Microsoft.Jet.OLEDB.4.0;" & "Data Source=C:\Inetpub\wwwroot\DOT\InforJ\db\newBD.mdb")
     Dim MyCommand As New OleDBDataAdapter("select * from catalogo where promo LIKE 'p%' order by promo", MyConnection)
     Dim DS As New DataSet

        If Not (Page.IsPostBack)

            MyCommand.Fill(DS)
        DS = Nothing
        DS = New DataSet()
    End If
Session("myDataSet") = DS
     MyCommand.Fill (DS, "Catalog")

            MyDataList.DataSource = DS.Tables(0).DefaultView
            MyDataList.DataBind()
       
    End Sub

Sub doSearch(Source as Object, E as EventArgs)
    Dim sSearchby as String
    MyDataList.visible="false"
    Dim strConn as string = "Provider=Microsoft.Jet.OLEDB.4.0;" & "Data Source=C:\Inetpub\wwwroot\DOT\InforJ\db\newBD.mdb"
    Dim MySQL as string = "Select * from Catalogo where " & dlsearchby.selectedItem.text & _
    " Like '%" & txtSearch.text & "%' order by ID"
    Trace.Warn("sql = " & MySQL)
    Dim MyConn as New OleDBConnection(strConn)
    Dim objDR as OledbDataReader
    Dim Cmd as New OleDBCommand(MySQL, MyConn)
    MyConn.Open()
    objDR=Cmd.ExecuteReader(system.data.CommandBehavior.CloseConnection)
    dlSearch.DataSource = objDR
    dlSearch.DataBind()
    MyConn.Close
dlSearch.visible="true"
End Sub

    Sub doInsert(Source as Object, E as EventArgs)
    Dim MySQL as string = "Insert into mailing (mail) values (@mail)"
    Dim myConn As OleDbConnection = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;" & _
     "Data Source=" & server.mappath("DB\newBD.mdb") & ";"    )

    Dim Cmd as New OleDbCommand(MySQL, MyConn)

    cmd.Parameters.Add(New OleDbParameter("@mail", frmfname.text))

    MyConn.Open()
    cmd.ExecuteNonQuery
    MyConn.Close()       
    label1.visible="true"
   
    label1.text = "<font size=1>E-mail adicionado."
    End Sub

Sub doit(Source as Object, E as EventArgs)
    response.Redirect ("page3.aspx")
End Sub

Sub MyDataList_Select(sender As Object, e As EventArgs)

    Response.Redirect("detail.aspx?id=@id")
End Sub

</script>

<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>inforJ  -  produtos informácticos</title>

<!-- ImageReady Preload Script (menu.psd) -->
<script type="text/javascript">
<!--

function newImage(arg) {
    if (document.images) {
        rslt = new Image();
        rslt.src = arg;
        return rslt;
    }
}

function changeImages() {
    if (document.images && (preloadFlag == true)) {
        for (var i=0; i<changeImages.arguments.length; i+=2) {
            document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
        }
    }
}

var preloadFlag = false;
function preloadImages() {
    if (document.images) {
        menu_inicio_over = newImage("images/menu_inicio-over.jpg");
        menu_tinteiros_over = newImage("images/menu_tinteiros-over.jpg");
        menu_hardware_over = newImage("images/menu_hardware-over.jpg");
        menu_software_over = newImage("images/menu_software-over.jpg");
        menu_webdesign_over = newImage("images/menu_webdesign-over.jpg");
        menu_encomendas_over = newImage("images/menu_encomendas-over.jpg");
        menu_contactos_over = newImage("images/menu_contactos-over.jpg");
        menu_campanha_over = newImage("images/menu_campanha-over.jpg");
        preloadFlag = true;
    }
}

// -->
</script>
<!-- End Preload Script -->

</head>

<body bgcolor="#FFFFFF" link="#000000" vlink="#000099" alink="#000099" onload="preloadImages();">

<table width="655" height="659" border="1" align="center" id="main">
  <tr>
    <td height="77" colspan="3"> <img src="images/pagina/cab.jpg" width="737" height="142" align="absmiddle"></td>
  </tr>
  <tr>
    <td width="158" valign="top" rowspan="2" align="center">
   
    <!-- ImageReady Slices (menu.psd) -->
    <table id="Table_01" width="153" height="290" border="0" cellpadding="0" cellspacing="0">
    <tr>
        <td colspan="3">
            <img src="images/menu_01.jpg" width="153" height="24" alt=""></td>
    </tr>
    <tr>
        <td rowspan="9">
            <img src="images/menu_02.jpg" width="8" height="266" alt=""></td>
        <td>
            <a href="default.aspx"
                onmouseover="changeImages('menu_inicio', 'images/menu_inicio-over.jpg'); return true;"
                onmouseout="changeImages('menu_inicio', 'images/menu_inicio.jpg'); return true;"
                onmousedown="changeImages('menu_inicio', 'images/menu_inicio-over.jpg'); return true;"
                onmouseup="changeImages('menu_inicio', 'images/menu_inicio-over.jpg'); return true;">
                <img name="menu_inicio" src="images/menu_inicio.jpg" width="138" height="30" border="0" alt=""></a></td>
        <td rowspan="9">
            <img src="images/menu_04.jpg" width="7" height="266" alt=""></td>
    </tr>
    <tr>
        <td>
            <a href="tinteiros.aspx"
                onmouseover="changeImages('menu_tinteiros', 'images/menu_tinteiros-over.jpg'); return true;"
                onmouseout="changeImages('menu_tinteiros', 'images/menu_tinteiros.jpg'); return true;"
                onmousedown="changeImages('menu_tinteiros', 'images/menu_tinteiros-over.jpg'); return true;"
                onmouseup="changeImages('menu_tinteiros', 'images/menu_tinteiros-over.jpg'); return true;">
                <img name="menu_tinteiros" src="images/menu_tinteiros.jpg" width="138" height="30" border="0" alt=""></a></td>
    </tr>
    <tr>
        <td>
            <a href="computadores.aspx"
                onmouseover="changeImages('menu_hardware', 'images/menu_hardware-over.jpg'); return true;"
                onmouseout="changeImages('menu_hardware', 'images/menu_hardware.jpg'); return true;"
                onmousedown="changeImages('menu_hardware', 'images/menu_hardware-over.jpg'); return true;"
                onmouseup="changeImages('menu_hardware', 'images/menu_hardware-over.jpg'); return true;">
                <img name="menu_hardware" src="images/menu_hardware.jpg" width="138" height="30" border="0" alt=""></a></td>
    </tr>
    <tr>
        <td>
            <a href="componentes.aspx"
                onmouseover="changeImages('menu_software', 'images/menu_software-over.jpg'); return true;"
                onmouseout="changeImages('menu_software', 'images/menu_software.jpg'); return true;"
                onmousedown="changeImages('menu_software', 'images/menu_software-over.jpg'); return true;"
                onmouseup="changeImages('menu_software', 'images/menu_software-over.jpg'); return true;">
                <img name="menu_software" src="images/menu_software.jpg" width="138" height="30" border="0" alt=""></a></td>
    </tr>
    <tr>
        <td>
            <a href="software.aspx"
                onmouseover="changeImages('menu_webdesign', 'images/menu_webdesign-over.jpg'); return true;"
                onmouseout="changeImages('menu_webdesign', 'images/menu_webdesign.jpg'); return true;"
                onmousedown="changeImages('menu_webdesign', 'images/menu_webdesign-over.jpg'); return true;"
                onmouseup="changeImages('menu_webdesign', 'images/menu_webdesign-over.jpg'); return true;">
                <img name="menu_webdesign" src="images/menu_webdesign.jpg" width="138" height="30" border="0" alt=""></a></td>
    </tr>
    <tr>
        <td>
            <a href="webd.aspx"
                onmouseover="changeImages('menu_encomendas', 'images/menu_encomendas-over.jpg'); return true;"
                onmouseout="changeImages('menu_encomendas', 'images/menu_encomendas.jpg'); return true;"
                onmousedown="changeImages('menu_encomendas', 'images/menu_encomendas-over.jpg'); return true;"
                onmouseup="changeImages('menu_encomendas', 'images/menu_encomendas-over.jpg'); return true;">
                <img name="menu_encomendas" src="images/menu_encomendas.jpg" width="138" height="30" border="0" alt=""></a></td>
    </tr>
    <tr>
        <td>
            <a href="contactos.aspx"
                onmouseover="changeImages('menu_contactos', 'images/menu_contactos-over.jpg'); return true;"
                onmouseout="changeImages('menu_contactos', 'images/menu_contactos.jpg'); return true;"
                onmousedown="changeImages('menu_contactos', 'images/menu_contactos-over.jpg'); return true;"
                onmouseup="changeImages('menu_contactos', 'images/menu_contactos-over.jpg'); return true;">
                <img name="menu_contactos" src="images/menu_contactos.jpg" width="138" height="30" border="0" alt=""></a></td>
    </tr>
    <tr>
        <td>
            <a href="download.aspx"
                onmouseover="changeImages('menu_campanha', 'images/menu_campanha-over.jpg'); return true;"
                onmouseout="changeImages('menu_campanha', 'images/menu_campanha.jpg'); return true;"
                onmousedown="changeImages('menu_campanha', 'images/menu_campanha-over.jpg'); return true;"
                onmouseup="changeImages('menu_campanha', 'images/menu_campanha-over.jpg'); return true;">
                <img name="menu_campanha" src="images/menu_campanha.jpg" width="138" height="36" border="0" alt=""></a></td>
    </tr>
    <tr>
        <td>
            <img src="images/menu_12.jpg" width="138" height="20" alt=""></td>
    </tr>
    </table>
    <!-- End ImageReady Slices -->
    <br>
    <img src="images/pagina/index2.jpg" width="153" height="73">
    </td>
        <td width="446" rowspan="4" valign="top" align="center">
   
         <img border="0" src="images/pagina/barraNews.jpg" width="400">
     
 
<form runat="server">

<asp:DropDownList id="dlsearchby" runat="server" />
<asp:TextBox id="txtSearch" runat="server" />
<asp:Button id="btnSearch" Text="Search" onclick="doSearch" runat="server" /><br>
<asp:RequiredFieldValidator ID="vldSearch"
    ControlToValidate="txtSearch"
    Display="Dynamic" runat="server">
        You must include search criteria
</asp:RequiredFieldValidator>

<asp:DataList runat="server"
    Id="dlSearch"
    GridLines="None"
    cellpadding="2"
    cellspacing="2"
    Headerstyle-BackColor="#000000"
    HeaderStyle-Forecolor="White"
    Headerstyle-Font-Name="Arial"
    Headerstyle-Font-Size="8"
    OnSelectedIndexChanged="MyDataList_Select"
    Font-Name="Arial"
    Font-Size="10"
    Width="100%">
    <HeaderTemplate>
       
        <b><i><font Size="2">Resultados de pesquisa </font></i></b>
        <br>
    </HeaderTemplate>
    <ItemTemplate>
        <b><%# Container.DataItem("produto")%></b><br>
        <a title="Detalhes de <%# DataBinder.Eval(Container.DataItem, "produto") %>" href="detail.aspx?id=<%# DataBinder.Eval(Container.DataItem, "ID") %>"><%# DataBinder.Eval(Container.DataItem, "produto") %></a>

        Categoria: <%# Container.DataItem("categoria")%><br>
        ID: <%# Container.DataItem("codigo")%><br>
    </ItemTemplate>
</ASP:DataList>

  <table border="0" width="100%">
    <tr>
      <td>
          <ASP:DataList id="MyDataList" RepeatColumns="2" RepeatDirection="Horizontal" runat="server">

              <ItemTemplate>

                <table width="100%" border="0" cellpadding=2 cellspacing=4 style='font: 8pt verdana'>
                  <tr>
                      <td width="200" valign="top" align="center">
            <b><%# DataBinder.Eval(Container.DataItem, "produto") %></b><br>
                      <IMG alt="foto" align="top" src='<%# DataBinder.Eval(Container.DataItem, "foto") %>' width="100" Border="0"><br>
            <%# DataBinder.Eval(Container.DataItem, "categoria") %><br>
            <a title="Detalhes de <%# DataBinder.Eval(Container.DataItem, "produto") %>" CommandName="Select" href="detailPC.aspx?id=<%# DataBinder.Eval(Container.DataItem, "ID") %>">Detalhes</a><br>
            <b><%# DataBinder.Eval(Container.DataItem, "preco", "{0:c}") %></b><br>
            <a title="Comprar <%# DataBinder.Eval(Container.DataItem, "produto") %>" CommandName="Select" onclick="doit" href="cart/page2.aspx?id=<%# DataBinder.Eval(Container.DataItem, "ID") %>"><font color="red">Comprar</font></a>
                    </td>
           
          </tr>
                </table>

              </ItemTemplate>

          </ASP:DataList>
      </td>

    </tr>
  </table>

    </td>
    <td width="153" height="136"><img src="images/pagina/pub02.jpg" width="153" height="132">
    <br><img src="images/pagina/pub01.jpg" width="153" height="207">
   
      <table border="0">
        <tr>
        <td align="center"><font size="2">Quero receber<br>novidades</td></tr>
        <tr><td align="center"> <asp:textbox columns="10" Text="e-mail" id="frmfname" runat="server" />
        <asp:RequiredFieldValidator
        runat="server"
        id="vldfname"
        ControlToValidate="frmfname"
        ErrorMessage=""
        display="dynamic"
        Font-Names="Arial" Font-Size="8">
        Inválido
        </asp:RequiredFieldValidator>

        <asp:RegularExpressionValidator
        id="emailRegexVal"
        ControlToValidate="frmfname"
        ErrorMessage="Email. "
        Display="dynamic"
        ValidationExpression="^[\w-]+@[\w-]+\.(pt|br|com|net|org|edu|mil)$"
        Font-Names="Arial" Font-Size="8" runat="server">
        Inválido. Deve ser email@host.domínio.
        </asp:RegularExpressionValidator></td>
    </tr>
    <tr>
        <td align="center"  colspan="2">
<asp:button id="button1" Text="Inserir" onclick="doInsert" runat="server" />
        </td>
    </tr>
</table>
<div align="center"><b><i><asp:Label ID="label1"  runat="server" /></i></b></div>

</Form>
    </td>
  </tr>
  <tr>
    <td height="211"></td>
  </tr>
  <tr>
    <td width="153" rowspan="2">&nbsp;</td>
  </tr>
  <tr>
    <td height="135">&nbsp;</td>
  </tr>
</table>
</body>
</html>

[/HTML] 

cart.aspx

[HTML]

<%@ Import Namespace="System.Data" %>
<%@ Page Language="VB" Debug="true" %>
<script language="VB" runat="server">
Sub Page_Load(Source as Object, E as EventArgs)
Dim ds as DataSet
    ds = CType(Session("myDataSet"), Dataset)
    MyDataGrid.Datasource=ds.Tables("Catalogo").DefaultView
    MyDataGrid.DataBind()
End Sub
</script>
<html>
<head>
    <title>Page 2</TITLE>
</head>
<body>
<Form id="form1" runat="server">
<div align="center">
<b><i>Employees Table</i></b>
<asp:Datagrid runat="server"
    Id="MyDataGrid"
    GridLines="Both"
    cellpadding="0"
    cellspacing="0"
    Headerstyle-BackColor="#8080C0"
    Headerstyle-Font-Name="Arial"
    Headerstyle-Font-Bold="True"
    Headerstyle-Font-Size="14"
    BackColor="#8080FF"
    Font-Name="Arial"
    Font-Size="11"
    AlternatingItemStyle-BackColor="#DFDFDF"
    AlternatingItemStyle-Font-Name="Arial"
    AlternatingItemStyle-Font-Size="11"
    BorderColor="Black">
</asp:DataGrid>
</Form>
</body>
</html>

 [/HTML]

I'm sorry for the size, but I really don't know where the error might be... Please help me, I'm getting desperate

Thanx in advance. 

0
comicghozt
9/11/2006 3:45:54 PM
asp.net.state-management 8807 articles. 0 followers. Follow

2 Replies
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Re Line 5: Dim ds as DataSet Line 6: ds = CType(Session("myDataSet"), Dataset)

try changing to

 If Session("myDataSet") Is  Nothing Then

  ' Handle session state missing

 Exit Sub 

Else

  Dim ds as DataSet Line 6: ds = CType(Session("myDataSet"), Dataset)

End If

 


Did the session state time out? (Was it more than 20 minutes from last action?)

What environment? (Win XP Pro/Home, Server 2000. Server 2003) 

 


Don't forget to click "Mark as Answer" on the post that helped you.
This credits that member, earns you a point and marks your thread as Resolved so we will all know you have been helped.
0
TATWORTH
9/12/2006 11:32:28 AM

Thank you TATWORTH.

I got it working with your suggestion!

Now I have another doubt: I managed to get the session passing a dataset but I'd like to get only the item I chose and not all the table.

How shall I do this?

Thanx in advance.

Ghozt 

0
comicghozt
9/13/2006 8:07:31 AM
Reply:

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Hello. I can't rename any parameters or variables. The menu entries for renaming or finding (local) references are disabled in the context menu and the key bindings does not work either. I'm using Delphi2010. Is there a way to fix this? Best Reagards. Martin S. wrote: > Hello. > > I can't rename any parameters or variables. The menu entries for > renaming or finding (local) references are disabled in the context > menu and the key bindings does not work either. > > I'm using Delphi2010. Is there a way to fix this? > Can you bui...

Can't get around this problem, Can't load
install_driver(Oracle) failed: Can't load '/home/morry/src/pcdesign,v14.x/lib/site_perl/5.005/sun4-solaris/auto/DBD/Oracle/Oracle.so' for module DBD::Oracle: ld.so.1: /usr/dist/share/perl5,v5.6.1/5bin.sun4/perl: fatal: relocation error: file /home/morry/src/pcdesign,v14.x/lib/site_perl/5.005/sun4-solaris/auto/DBD/Oracle/Oracle.so: symbol Perl_no_modify: referenced symbol not found at /usr/dist/share/perl5,v5.6.1/lib/sun4-solaris/DynaLoader.pm line 206, <BOM> line 5362. at (eval 1) line 3 Compilation failed in require at (eval 1) line 3, <BOM> line 536...

can't get any support and can't open firefox
Name: Jacquelyn Flora Email: jacquelynfloraatmacdotcom Product: Firefox Summary: can't get any support and can't open firefox Comments: I am so completely frustrated since I have been trying to resolve this issue for weeks. I cannot open firefox at all ever since I upgraded (big mistake) to 3.0.5 and then 3.0.6. Your support site isn't worth anything because it doesn't answer any of the questions. I am so frustrated that I am ready to give up. Browser Details: Mozilla/5.0 (Macintosh; U; PPC Mac OS X 10_4_11; en) AppleWebKit/525.27.1 (KHTML, like...

Desperate!!!! -- can't get DNN4 with sqlexpress2005 to work on winxp --- can't connect to DB!!!!!
HELP!!!!! HELP!!!!I followed the install guide for DNN4 (install version)...but it doesn't work with SQL 2005 express on Win XP...i have tried everything!! below is the error message and the connection strings...HELP!!!   Error Installing DotNetNukeCurrent Assembly Version: 04.00.00ERROR: Could not connect to database specified in connectionString for SqlDataProviderSystem.Data.SqlClient.SqlException: Unable to open the physical file "C:\dotnetnuke\App_Data\dotnetnuke.mdf". Operating system error 5: "5(Access is denied.)". An attempt to attach an auto-named database for file C:\dotne...

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