Object variable or With block variable not set.

  • Thread starter sista via DotNetMonster.com
  • Start date


sista via DotNetMonster.com

hi.. just wondering what does this error means?

here's my vb code:
Imports System.Web.Security
Imports System.Data
Imports System.Data.OleDb

Public Class dpitem
Inherits System.Web.UI.Page

#Region " Web Form Designer Generated Code "

'This call is required by the Web Form Designer.
<System.Diagnostics.DebuggerStepThrough()> Private Sub

End Sub
'NOTE: The following placeholder declaration is required by the Web
Form Designer.
'Do not delete or move it.
Private designerPlaceholderDeclaration As System.Object

Private Sub Page_Init(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Init
'CODEGEN: This method call is required by the Web Form Designer
'Do not modify it using the code editor.
End Sub

#End Region

Protected WithEvents MyDataList As System.Web.UI.WebControls.DataList
Protected WithEvents mydatalist2 As System.Web.UI.WebControls.DataList
Protected WithEvents sc As System.Web.UI.WebControls.HyperLink
Protected WithEvents name As System.Web.UI.WebControls.Label
Protected WithEvents subs As System.Web.UI.WebControls.Label
Protected WithEvents qty As System.Web.UI.WebControls.Label
Protected WithEvents buyqty As System.Web.UI.WebControls.TextBox
Protected WithEvents add As System.Web.UI.WebControls.ImageButton
Protected WithEvents dg As System.Web.UI.WebControls.DataGrid
Protected WithEvents lblTotal As System.Web.UI.WebControls.Label
Dim pid As String

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
'Put user code to initialize the page here
If Not IsPostBack Then
End If
Dim ds As DataSet
Dim ds2 As DataSet
Dim MyConnection As OleDbConnection
Dim MyCommand As OleDbDataAdapter
pid = Request.QueryString("pid")
Dim P As New PartyHouse

ds = P.getSub("*", "lydiasun_product", "pid", pid, "", "")
MyDataList.DataSource = ds.Tables("lydiasun_product").DefaultView

With ds.Tables("lydiasun_product").Rows(0)
name.Text = .Item("pname")
subs.Text = .Item("subcategory")
sc.Text = .Item("subcategory")
sc.NavigateUrl = "subcategory.aspx?subcategory=" & .Item
qty.Text = P.sizing(.Item("allsizes"), .Item("small"), .Item
("medium"), .Item("large"))
End With

ds2 = P.getSub("distinct subcategory", "lydiasun_product",
"category", "Decoration & Props", "", "")

mydatalist2.DataSource = ds2.Tables("lydiasun_product").DefaultView
End Sub

Dim objDT As DataTable
Dim objDR As DataRow

Sub addtocart(ByVal s As Object, ByVal e As ImageClickEventArgs)
'Dim pid As String = Request.QueryString("pid")

'Dim ds As DataSet
'Dim p As New PartyHouse
lblTotal.Text = "pid is:" & pid
Dim match As Boolean
objDT = Session("cart")
'ds = p.getSub("*", "lydiasun_product", "pid", pid, "", "")

If objDT.Rows.Count = 0 Then
objDR = objDT.NewRow
objDR("pid") = "dpp101"
objDR("qty") = CInt(Request.Form("buyqty"))
objDR("price") = 1.99
'With ds.Tables("lydiasun_product").Rows(0)
' objDR("pid") = .Item("pid")
' objDR("qty") = Request.Form("buyqty")
' objDR("img") = .Item("img")
' objDR("pname") = .Item("pname")
' objDR("pdesc") = .Item("pdesc")
' objDR("price") = .Item("price")
If Session("email") = "" Then
objDR("user") = "guest"
objDR("user") = Session("email")
End If
'End With
'objDR("size") = "all size"

For Each objDR In objDT.Rows
If objDR("pid") = pid Then
objDR("qty") += CInt(Request.Form("buyqty"))
match = True
Exit For
End If
If Not match Then
objDR = objDT.NewRow
'With ds.Tables("lydiasun_product").Rows(0)
objDR("pid") = pid
objDR("qty") = CInt(Request.Form("buyqty"))
objDR("price") = 1.99
'objDR("img") = .Item("img")
'objDR("pname") = .Item("pname")
'objDR("pdesc") = .Item("pdesc")
'objDR("price") = .Item("price")
If Session("email") = "" Then
objDR("user") = "guest"
objDR("user") = Session("email")
End If

'End With
'objDR("size") = "all size"

End If
End If
Session("cart") = objDT
dg.DataSource = objDT
lblTotal.Text = lblTotal.Text & "<br>$" & GetItemTotal()


End Sub

Function makeCart()
If Nothing(Session("cart")) Then

objDT = New DataTable("Cart")
objDT.Columns.Add("ID", GetType(Integer))
objDT.Columns("ID").AutoIncrement = True
objDT.Columns("ID").AutoIncrementSeed = 1

objDT.Columns.Add("pid", GetType(String))
objDT.Columns.Add("qty", GetType(Integer))
'objDT.Columns.Add("img", GetType(String))
'objDT.Columns.Add("pname", GetType(String))
'objDT.Columns.Add("pdesc", GetType(String))
objDT.Columns.Add("price", GetType(Decimal))
objDT.Columns.Add("user", GetType(String))

Session("Cart") = objDT
End If
End Function

Function GetItemTotal() As Decimal

Dim intCounter As Integer
Dim decRunningTotal As Decimal

For intCounter = 0 To objDT.Rows.Count - -1
objDR = objDT.Rows(intCounter)
decRunningTotal += (objDR("price") * objDR("qty"))

Return decRunningTotal

End Function

End Class



Larry Lard

sista said:
hi.. just wondering what does this error means?

It usually means you've used an object variable that hasn't been
initialized. Can you tell us which line the error occurs on ?
Function makeCart()
If Nothing(Session("cart")) Then

I don't know what this actually does (if anything!) but I strongly
suspect that what you mean is

If Session("cart") Is Nothing Then

To the group: Why does the original compile? What does it mean?



Cor Ligthert


You found the error in all that code.

On your question, try this.

If DirectCast(Nothing, Object) Is Nothing Then
Response.Write("I am just an object")
End If

With Option Strict Off it compiles as always in this kind of situation.


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