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Object reference not set..

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Damian Barrow

Anyone see what I'm doing wrong here?

I'm using a control (ships.ascx) on my page and I pass to it the value
of the parent page.

So - parentpage (pando.aspx in this case)

<%@ Page Language=3D"vb" Explicit=3D"True" EnableSessionState=3D"True"
smartnavigation=3D"True" Strict=3D"True" %>
<%@ Register TagPrefix=3D"showShips" tagName=3D"shipsBit"
src=3D"/cruise/ships.ascx" %>
<%@ import Namespace=3D"System.Data" %>
<%@ import Namespace=3D"System.Data.SqlClient" %>

<script language=3D"VB" runat=3D"server">

Public Sub Page_Load(Sender as Object, E as EventArgs)
Dim strPP as String =3D "pando.aspx"
myShips.parentPage =3D strPP

If Not Page.IsPostBack Then

BindGrid()

' ######################## etc etc etc..........
</script>

Blah

<showShips:shipsBit id=3D"myShips" runat=3D"server" />

'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

And the ships.ascx is

<%@ Control Language=3D"vb" %>
<%@ import Namespace=3D"System.Data" %>
<%@ import Namespace=3D"System.Data.SQLClient" %>
<%@ outputcache duration=3D"1800" varybyparam=3D"None" %>

<script runat=3D"server" language=3D"VB">
Public Writeonly Property parentPage as String
    Set=20
        txt_parentPage.Text =3D value
    End Set
End Property
</script>
<asp:label id=3D"txt_parentPage" runat=3D"server"
Visible=3D"false"></asp:label>

Etc

When I pass the value it says:
Object reference not set to an instance of an object.=20
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.=20

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

Source Error:=20

Line 12: Public Sub Page_Load(Sender as Object, E as EventArgs)
Line 13: Dim strPP as String =3D "pando.aspx"
Line 14: myShips.parentPage =3D strPP
Line 15:=20
Line 16:     if request.QueryString("sm")<>"FALSE" THEN=20

Help?!
Cheers
Damian

Reply to this message...

Daniel Naumann

Damian,

From your code snippet you haven't declared what "myships" is. Do you have
Option Explicit on? You should, this will pick up any undeclared variables.

You need something like:
Dim myships as ships

Daniel.

-----Original Message-----
From: Damian Barrow [mailto:Click here to reveal e-mail address]
Sent: 26-Jul-2002 08:25
To: aspngreuse
Subject: [aspngreuse] Object reference not set..

Anyone see what I'm doing wrong here?

I'm using a control (ships.ascx) on my page and I pass to it the value
of the parent page.

So - parentpage (pando.aspx in this case)

<%@ Page Language="vb" Explicit="True" EnableSessionState="True"
smartnavigation="True" Strict="True" %>
<%@ Register TagPrefix="showShips" tagName="shipsBit"
src="/cruise/ships.ascx" %>
<%@ import Namespace="System.Data" %>
<%@ import Namespace="System.Data.SqlClient" %>

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

Public Sub Page_Load(Sender as Object, E as EventArgs)
Dim strPP as String = "pando.aspx"
myShips.parentPage = strPP

If Not Page.IsPostBack Then

BindGrid()

' ######################## etc etc etc..........
</script>

Blah

<showShips:shipsBit id="myShips" runat="server" />

'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

And the ships.ascx is

<%@ Control Language="vb" %>
<%@ import Namespace="System.Data" %>
<%@ import Namespace="System.Data.SQLClient" %>
<%@ outputcache duration="1800" varybyparam="None" %>

<script runat="server" language="VB">
Public Writeonly Property parentPage as String
    Set
        txt_parentPage.Text = value
    End Set
End Property
</script>
<asp:label id="txt_parentPage" runat="server"
Visible="false"></asp:label>

Etc

When I pass the value it says:
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 12: Public Sub Page_Load(Sender as Object, E as EventArgs)
Line 13: Dim strPP as String = "pando.aspx"
Line 14: myShips.parentPage = strPP
Line 15:
Line 16:     if request.QueryString("sm")<>"FALSE" THEN

Help?!
Cheers
Damian

| [aspngreuse] member Click here to reveal e-mail address = YOUR ID
| http://www.aspfriends.com/aspfriends/aspngreuse.asp = JOIN/QUIT

Reply to this message...

	System.EventArgs
	System.NullReferenceException
	System.Web.UI.Page

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