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Null Exception error - Kindly help me

WebForm1.aspx Code:

<%@ Register TagPrefix="Comp onentArt" Namespace="Comp onentArt.Web.UI "
Assembly="Compo nentArt.Web.UI" %> <ComponentArt:T reeView
id="TreeView1" Height="520" AutoPostBackOnN odeMove="false"
DragAndDropEnab led="true"
NodeEditingEnab led="False" KeyboardEnabled ="true"
CssClass="TreeV iew" NodeCssClass="T reeNode"
SelectedNodeCss Class="Selected TreeNode"
HoverNodeCssCla ss="HoverTreeNo de" NodeEditCssClas s="NodeEdit"
LineImageWidth= "19" LineImageHeight ="20"
DefaultImageWid th="16" DefaultImageHei ght="16" ItemSpacing="0"
NodeLabelPaddin g="3" SpacerImageUrl= "/MRCSWebApp/Images/spacer.gif"
CollapseImageUr l="/MRCSWebApp/Images/exp.gif"
ExpandImageUrl= "/MRCSWebApp/Images/col.gif"
ParentNodeImage Url="/MRCSWebApp/Images/folders.gif"
LeafNodeImageUr l="/MRCSWebApp/Images/folder.gif"
ShowLines="true " LineImagesFolde rUrl="/MRCSWebApp/Images/lines/"
EnableViewState ="true"
ClientScriptLoc ation="~/client_scripts/componentart_we bui_client/"
runat="server"> </ComponentArt:Tr eeView>
BackEnd Code:

Imports MRCS_Class.File Utilities
Imports System.Data
Imports System.Data.Sql Client
Imports System.Data.Sql Types
Imports System.Data.Ole Db
Imports MRCS_Class.Logi nClass
Imports MRCSWebApp.Welc ome
Imports System.Data.Sql DbType
Imports System
Imports System.Collecti ons
Imports System.Componen tModel
Imports System.Drawing
Imports System.Web
Imports System.Web.Sess ionState
Imports System.Web.UI
Imports System.Web.UI.W ebControls
Imports System.Web.UI.H tmlControls
Imports MRCS_Class.Sear ch
Imports ComponentArt.We b.UI
Public Class AdvancedSearch
Inherits System.Web.UI.P age
Public objDataReader As IDataReader

#Region " Web Form Designer Generated Code "

'This call is required by the Web Form Designer.
<System.Diagnos tics.DebuggerSt epThrough()> Private Sub
InitializeCompo nent()

End Sub
Protected WithEvents TreeView1 As ComponentArt.We b.UI.TreeView
Protected WithEvents MRN As System.Web.UI.W ebControls.Text Box
Protected WithEvents SSN As System.Web.UI.W ebControls.Text Box
Protected WithEvents Lname As System.Web.UI.W ebControls.Text Box
Protected WithEvents Fname As System.Web.UI.W ebControls.Text Box
Protected WithEvents DOB As System.Web.UI.W ebControls.Text Box
Protected WithEvents AdvancedGrid As
System.Web.UI.W ebControls.Data Grid
Protected WithEvents AdvSearch As System.Web.UI.W ebControls.Butt on

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

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

#End Region
Dim oConn As SqlConnection
Dim objReader As IDataReader
Public UserID As Int16
Dim FetchType As String
Dim oDS As New DataSet
Dim DView As DataView
Dim MenuID As Integer
Dim MenuProfileID As Integer

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArg s) Handles MyBase.Load
'Put user code to initialize the page here
' If Not IsPostBack = True Then
ID = Request("GUID")
Login(ID)
' End If
End Sub
Public Sub Login(ByVal GID)

Try
Dim objCon As New SqlConnection(" Initial Catalog=MRCS;
Data Source=DEVBOX;u id=devuser;pwd= xxxx")
objCon.Open()
' Set Command object properties
Dim objCmd As New SqlCommand
Dim objCmd1 As New SqlCommand
With objCmd
.Connection = objCon
.CommandText = "procLogin_Retr eiveSession"
.CommandType = CommandType.Sto redProcedure
.Parameters.Add ("@SESSIONID ", SqlDbType.VarCh ar,
255).Value = GID
End With
objReader = objCmd.ExecuteR eader
objReader.Read( )
If Not objReader.IsDBN ull(0) Then
UserID = objReader.GetVa lue(0)
End If
objReader.Close ()

With objCmd1
.Connection = objCon
.CommandText = "procProfileDet ail_Retreive"
.CommandType = CommandType.Sto redProcedure
.Parameters.Add ("@UserID", SqlDbType.BigIn t).Value =
UserID
End With
objDataReader = objCmd1.Execute Reader
objDataReader.R ead()
If Not objDataReader.I sDBNull(0) Then
MenuProfileID = objDataReader.G etValue(0)
End If

buildTree(MenuP rofileID)
Catch ex As Exception
Dim clsError As MRCS_Class.File Utilities
clsError = New MRCS_Class.File Utilities
With clsError
.CreateErrorLog (Err.Number, Err.Description )
End With
End Try
End Sub
' Build Tree, Populate Sub Tree and Create Node are Used to create
the tree
Private Sub buildTree(ByVal MenuProfileID)

Dim dbCon As New SqlConnection(" Initial Catalog=MRCS; Data
Source=DEVBOX;u id=devuser;pwd= xxxxx")
dbCon.Open()

Dim adapter As New SqlDataAdapter( "SELECT * FROM tblMenu LEFT
OUTER JOIN tblMenuProfileD etails ON tblMenu.MenuID =
tblMenuProfileD etails.MenuID WHERE tblMenuProfileD etails.MenuProf ileID
=" & MenuProfileID & "OR tblMenu.ParentN odeID IS NULL OR
tblMenu.ParentN odeID = 1 ORDER BY tblMenu.MenuID ASC", dbCon)
Dim ds As New System.Data.Dat aSet
adapter.Fill(ds )
ds.Relations.Ad d("NodeRelation ",
ds.Tables(0).Co lumns("MenuID") , ds.Tables(0).Co lumns("ParentNo deID"))
Dim dbRow As System.Data.Dat aRow
For Each dbRow In ds.Tables(0).Ro ws
If (dbRow.IsNull(" ParentNodeID")) Then
Dim newNode As ComponentArt.We b.UI.TreeViewNo de
newNode = CreateNode(dbRo w("Text").ToStr ing(),
dbRow("ImageURL ").ToString (), dbRow("RefURL") .ToString(), True)
TreeView1.Nodes .Add(newNode)
PopulateSubTree (dbRow, newNode)
End If
Next dbRow

End Sub
' Build Tree, Populate Sub Tree and Create Node are Used to create
the tree
Private Sub PopulateSubTree (ByVal dbRow As System.Data.Dat aRow,
ByVal node As ComponentArt.We b.UI.TreeViewNo de)
Dim childRow As System.Data.Dat aRow
For Each childRow In dbRow.GetChildR ows("NodeRelati on")
Dim childNode As ComponentArt.We b.UI.TreeViewNo de
childNode = New ComponentArt.We b.UI.TreeViewNo de
childNode = CreateNode(chil dRow("Text").To String(),
childRow("Image URL").ToString( ), childRow("RefUR L").ToString (), True)
node.Nodes.Add( childNode)
PopulateSubTree (childRow, childNode)
Next childRow
End Sub
' Build Tree, Populate Sub Tree and Create Node are Used to create
the tree
Private Function CreateNode(ByVa l text As String, ByVal imageurl
As String, ByVal refurl As String, ByVal expanded As Boolean) As
ComponentArt.We b.UI.TreeViewNo de
Dim MsgID As Integer
Dim PID As Integer
Dim MsgType As String
Dim node As ComponentArt.We b.UI.TreeViewNo de
node = New ComponentArt.We b.UI.TreeViewNo de
node.Text = text
node.ImageUrl = imageurl
node.Expanded = expanded
node.NavigateUr l = refurl & "?MsgID=" & Request("MsgID" ) &
"&PID=" & Request("PID") & "&MsgType=" & Request("MsgTyp e") & "&GUID="
& Request("GUID")

Return node
End Function

This returns a error as below:

Server Error in '/MRCSWebApp' Application.
--------------------------------------------------------------------------------

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.NullRefe renceException: Object reference not
set to an instance of an object.

Source Error:

An unhandled exception was generated during the execution of the
current web request. Information regarding the origin and location of
the exception can be identified using the exception stack trace below.

Stack Trace:
[NullReferenceEx ception: Object reference not set to an instance of an
object.]
System.Web.UI.C ontrol.FindCont rol(String id, Int32 pathOffset) +178
System.Web.UI.C ontrol.FindCont rol(String id) +9
ComponentArt.We b.UI.BaseNaviga tor.UpdateSelec tedNode() +127
ComponentArt.We b.UI.BaseNaviga tor.OnLoad(Even tArgs e) +290
ComponentArt.We b.UI.TreeView.O nLoad(EventArgs e) +19
System.Web.UI.C ontrol.LoadRecu rsive() +35
System.Web.UI.C ontrol.LoadRecu rsive() +98
System.Web.UI.C ontrol.LoadRecu rsive() +98
System.Web.UI.P age.ProcessRequ estMain() +731
Kindly help me out.
Thank you
Murali.
Nov 18 '05 #1
0 1592

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