Cookie being deleted unexpectedly by the application - asp.net

Question

I am having an issue with a cookie that keeps getting deleted by the application. When you go into the application, if the cookie does not exist, it gets created. This works fine and everything in the cookie is stored correctly.
When I click on a link to go to another page, once everything loads completely, the cookie gets deleted from the file system. Even stranger than that, the values from the cookie remain until the browser is closed. That is the application appears to be retaining the values even though the cookie does not exist on the local file system. The next time you enter the application, the cookie is recreated so any values stored are lost.
Now, I have done some tweaking on the code to see what could be causing it. I found that I am adding the cookie to the Response object any time I make a change to the cookie. The cookie is also being added to the Response object when the page load is completed. My initial thought was that adding the cookie multiple times to the Response object could be causing the issue. I commented out the code in the page load complete event and the cookie hung around until the next postback. Then I put in some logic to keep the application from putting the cookie into the Response object more than once, and then I lost the cookie again at the same point as before.
All of the code for handling cookies is in my "base page" that all pages inherit from. The page that seems to be loosing the cookie is my search page. I am including the code from both of those pages.
BasePage.vb
Public Class BasePage
Inherits Page
#Region "attributes"
Private _cookie As HttpCookie
Private _savedCookie As Boolean
Private Const COOKIE_NAME As String = "KDOELog"
Private Const COOKIE_COLUMNS As String = "cols"
Private Const COOKIE_SEARCH_BRANCH As String = "b"
Private Const COOKIE_SEARCH_COLLECTOR As String = "c"
Private Const COOKIE_SEARCH_CONF_NUMBER As String = "a"
Private Const COOKIE_SEARCH_NA_NUMBER As String = "n"
Private Const COOKIE_SEARCH_CUST_NUMBER As String = "u"
Private Const COOKIE_SEARCH_INV_NUMBER As String = "i"
Private Const COOKIE_SEARCH_CONTRACT As String = "t"
Private Const COOKIE_SEARCH_ORDER_TYPE As String = "y"
Private Const COOKIE_SEARCH_DSR_NUMBER As String = "r"
Private Const COOKIE_SEARCH_DSM_NUMBER As String = "m"
Private Const COOKIE_SEARCH_EXCEPTION As String = "e"
Private Const COOKIE_SEARCH_START_DATE As String = "s"
Private Const COOKIE_SEARCH_END_DATE As String = "d"
Private Const COOKIE_PAGE_INDEX As String = "pg"
Private Const COOKIE_SORT_COLUMN As String = "sc"
Private Const COOKIE_SORT_DIRECTION As String = "sd"
Private Const SESSION_USER As String = "user"
#End Region
#Region "constructor"
Public Sub New()
_savedCookie = False
End Sub
#End Region
#Region "events"
Private Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If IsPostBack = False Then
' determines whether or not to show the link for Node Search
Dim myMaster As Food = DirectCast(Me.Master, Food)
If AuthenticatedUser.IsCorporateAdmin Or AuthenticatedUser.IsBranchAdmin Then
myMaster.ShowNodeItemLink = True
Else
myMaster.ShowNodeItemLink = False
End If
End If
End Sub
Private Sub Page_LoadComplete(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.LoadComplete
If _savedCookie = False Then Response.Cookies.Add(_cookie)
End Sub
Private Sub Page_PreInit(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.PreInit
If IsNothing(Request.Cookies(COOKIE_NAME)) Then
_cookie = New HttpCookie(COOKIE_NAME)
_cookie.Expires = New Date(2999, 12, 31)
_cookie.Values.Add(COOKIE_COLUMNS, GetDefaultColumnList())
_cookie.Values.Add(COOKIE_SEARCH_BRANCH, String.Empty)
_cookie.Values.Add(COOKIE_SEARCH_COLLECTOR, String.Empty)
_cookie.Values.Add(COOKIE_SEARCH_CONF_NUMBER, String.Empty)
_cookie.Values.Add(COOKIE_SEARCH_NA_NUMBER, String.Empty)
_cookie.Values.Add(COOKIE_SEARCH_CUST_NUMBER, String.Empty)
_cookie.Values.Add(COOKIE_SEARCH_INV_NUMBER, String.Empty)
_cookie.Values.Add(COOKIE_SEARCH_CONTRACT, String.Empty)
_cookie.Values.Add(COOKIE_SEARCH_ORDER_TYPE, String.Empty)
_cookie.Values.Add(COOKIE_SEARCH_DSR_NUMBER, String.Empty)
_cookie.Values.Add(COOKIE_SEARCH_DSM_NUMBER, String.Empty)
_cookie.Values.Add(COOKIE_SEARCH_EXCEPTION, String.Empty)
_cookie.Values.Add(COOKIE_SEARCH_START_DATE, String.Empty)
_cookie.Values.Add(COOKIE_SEARCH_END_DATE, String.Empty)
_cookie.Values.Add(COOKIE_PAGE_INDEX, 0)
_cookie.Values.Add(COOKIE_SORT_COLUMN, "eback_datetime")
_cookie.Values.Add(COOKIE_SORT_DIRECTION, SORT_DIRECTION_ASC)
SaveCookie()
Else
_cookie = Request.Cookies(COOKIE_NAME)
End If
If IsNothing(Session(SESSION_USER)) Then Session(SESSION_USER) = New User(Context.User.Identity.Name)
End Sub
#End Region
#Region "methods"
Protected Function GetColumnList() As String()
Return Server.HtmlEncode(_cookie(COOKIE_COLUMNS)).Split(",")
End Function
Private Function GetDefaultColumnList() As String
' set the default list of columns
Dim columnList As New StringBuilder()
columnList.Append(COL_COLLECTOR).Append(",")
columnList.Append(COL_CONF_NUM).Append(",")
columnList.Append(COL_NODE_NUM).Append(",")
columnList.Append(COL_ORDER_TYPE).Append(",")
columnList.Append(COL_CUST_NUM).Append(",")
columnList.Append(COL_ERROR_IND).Append(",")
columnList.Append(COL_DSR_NUM).Append(",")
columnList.Append(COL_DSR_NAME).Append(",")
columnList.Append(COL_DSM_NUM).Append(",")
columnList.Append(COL_CONTRACT).Append(",")
columnList.Append(COL_NA_NUM).Append(",")
columnList.Append(COL_NA_SUB).Append(",")
columnList.Append(COL_INV_NUM).Append(",")
columnList.Append(COL_CONF_DATE).Append(",")
columnList.Append(COL_LINE_ITEMS).Append(",")
columnList.Append(COL_DELV_DATE).Append(",")
columnList.Append(COL_SALES_AMT).Append(",")
columnList.Append(COL_BRANCH)
Return columnList.ToString()
End Function
Protected Function HasSearchValues() As Boolean
Return CBool(_cookie(COOKIE_SEARCH_BRANCH) > String.Empty Or _
_cookie(COOKIE_SEARCH_COLLECTOR) > String.Empty Or _
_cookie(COOKIE_SEARCH_CONF_NUMBER) > String.Empty Or _
_cookie(COOKIE_SEARCH_NA_NUMBER) > String.Empty Or _
_cookie(COOKIE_SEARCH_CUST_NUMBER) > String.Empty Or _
_cookie(COOKIE_SEARCH_INV_NUMBER) > String.Empty Or _
_cookie(COOKIE_SEARCH_CONTRACT) > String.Empty Or _
_cookie(COOKIE_SEARCH_ORDER_TYPE) > String.Empty Or _
_cookie(COOKIE_SEARCH_DSR_NUMBER) > String.Empty Or _
_cookie(COOKIE_SEARCH_DSM_NUMBER) > String.Empty Or _
_cookie(COOKIE_SEARCH_EXCEPTION) > String.Empty Or _
_cookie(COOKIE_SEARCH_START_DATE) > String.Empty Or _
_cookie(COOKIE_SEARCH_END_DATE) > String.Empty)
End Function
Protected Sub ResetSearchValues()
_cookie(COOKIE_SEARCH_BRANCH) = String.Empty
_cookie(COOKIE_SEARCH_COLLECTOR) = String.Empty
_cookie(COOKIE_SEARCH_CONF_NUMBER) = String.Empty
_cookie(COOKIE_SEARCH_NA_NUMBER) = String.Empty
_cookie(COOKIE_SEARCH_CUST_NUMBER) = String.Empty
_cookie(COOKIE_SEARCH_INV_NUMBER) = String.Empty
_cookie(COOKIE_SEARCH_CONTRACT) = String.Empty
_cookie(COOKIE_SEARCH_ORDER_TYPE) = String.Empty
_cookie(COOKIE_SEARCH_DSR_NUMBER) = String.Empty
_cookie(COOKIE_SEARCH_DSM_NUMBER) = String.Empty
_cookie(COOKIE_SEARCH_EXCEPTION) = String.Empty
_cookie(COOKIE_SEARCH_START_DATE) = String.Empty
_cookie(COOKIE_SEARCH_END_DATE) = String.Empty
_cookie(COOKIE_PAGE_INDEX) = 0
_cookie(COOKIE_SORT_COLUMN) = "eback_datetime"
_cookie(COOKIE_SORT_DIRECTION) = SORT_DIRECTION_ASC
SaveCookie()
End Sub
Protected Sub SaveCookie()
If _savedCookie = False Then
Response.Cookies.Add(_cookie)
_savedCookie = True
End If
End Sub
Protected Sub SetColumnList(ByVal ColumnList As String)
_cookie(COOKIE_COLUMNS) = ColumnList
SaveCookie()
End Sub
#End Region
#Region "properties"
Public ReadOnly Property AuthenticatedUser() As User
Get
If IsNothing(Session(SESSION_USER)) Then Session(SESSION_USER) = New User(Context.User.Identity.Name)
Return DirectCast(Session(SESSION_USER), User)
End Get
End Property
Public ReadOnly Property UserName() As String
Get
Return Context.User.Identity.Name
End Get
End Property
Public Property SearchBranch() As String
Get
Return _cookie(COOKIE_SEARCH_BRANCH)
End Get
Set(ByVal value As String)
_cookie(COOKIE_SEARCH_BRANCH) = value
End Set
End Property
Public Property SearchCollector() As String
Get
Return _cookie(COOKIE_SEARCH_COLLECTOR)
End Get
Set(ByVal value As String)
_cookie(COOKIE_SEARCH_COLLECTOR) = value
End Set
End Property
Public Property SearchConfirmationNumber() As String
Get
Return _cookie(COOKIE_SEARCH_CONF_NUMBER)
End Get
Set(ByVal value As String)
_cookie(COOKIE_SEARCH_CONF_NUMBER) = value
End Set
End Property
Public Property SearchNationalAccountNumber() As String
Get
Return _cookie(COOKIE_SEARCH_NA_NUMBER)
End Get
Set(ByVal value As String)
_cookie(COOKIE_SEARCH_NA_NUMBER) = value
End Set
End Property
Public Property SearchCustomerNumber() As String
Get
Return _cookie(COOKIE_SEARCH_CUST_NUMBER)
End Get
Set(ByVal value As String)
_cookie(COOKIE_SEARCH_CUST_NUMBER) = value
End Set
End Property
Public Property SearchInvoiceNumber() As String
Get
Return _cookie(COOKIE_SEARCH_INV_NUMBER)
End Get
Set(ByVal value As String)
_cookie(COOKIE_SEARCH_INV_NUMBER) = value
End Set
End Property
Public Property SearchContract() As String
Get
Return _cookie(COOKIE_SEARCH_CONTRACT)
End Get
Set(ByVal value As String)
_cookie(COOKIE_SEARCH_CONTRACT) = value
End Set
End Property
Public Property SearchOrderType() As String
Get
Return _cookie(COOKIE_SEARCH_ORDER_TYPE)
End Get
Set(ByVal value As String)
_cookie(COOKIE_SEARCH_ORDER_TYPE) = value
End Set
End Property
Public Property SearchDsrNumber() As String
Get
Return _cookie(COOKIE_SEARCH_DSR_NUMBER)
End Get
Set(ByVal value As String)
_cookie(COOKIE_SEARCH_DSR_NUMBER) = value
End Set
End Property
Public Property SearchDsmNumber() As String
Get
Return _cookie(COOKIE_SEARCH_DSM_NUMBER)
End Get
Set(ByVal value As String)
_cookie(COOKIE_SEARCH_DSM_NUMBER) = value
End Set
End Property
Public Property SearchErrorType() As String
Get
Return _cookie(COOKIE_SEARCH_EXCEPTION)
End Get
Set(ByVal value As String)
_cookie(COOKIE_SEARCH_EXCEPTION) = value
End Set
End Property
Public Property SearchStartDate() As String
Get
Return _cookie(COOKIE_SEARCH_START_DATE)
End Get
Set(ByVal value As String)
_cookie(COOKIE_SEARCH_START_DATE) = value
End Set
End Property
Public Property SearchEndDate() As String
Get
Return _cookie(COOKIE_SEARCH_END_DATE)
End Get
Set(ByVal value As String)
_cookie(COOKIE_SEARCH_END_DATE) = value
End Set
End Property
Public Property PageIndex() As String
Get
Return _cookie(COOKIE_PAGE_INDEX)
End Get
Set(ByVal value As String)
_cookie(COOKIE_PAGE_INDEX) = value
End Set
End Property
Public Property SortColumn() As String
Get
Return _cookie(COOKIE_SORT_COLUMN)
End Get
Set(ByVal value As String)
_cookie(COOKIE_SORT_COLUMN) = value
End Set
End Property
Public Property SortDirection() As String
Get
Return _cookie(COOKIE_SORT_DIRECTION)
End Get
Set(ByVal value As String)
_cookie(COOKIE_SORT_DIRECTION) = value
End Set
End Property
#End Region
End Class
Search.aspx.vb
Public Partial Class Search
Inherits BasePage
#Region "attributes"
#End Region
#Region "events"
Private Sub btnColumnSave_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnColumnSave.Click
Dim columns As New StringBuilder
If chkCollector.Checked Then columns.Append(COL_COLLECTOR).Append(",")
If chkAckNumber.Checked Then columns.Append(COL_CONF_NUM).Append(",")
If chkNodeNumber.Checked Then columns.Append(COL_NODE_NUM).Append(",")
If chkOrderType.Checked Then columns.Append(COL_ORDER_TYPE).Append(",")
If chkCustNumber.Checked Then columns.Append(COL_CUST_NUM).Append(",")
If chkCustName.Checked Then columns.Append(COL_CUST_NAME).Append(",")
If chkOrderExceptions.Checked Then columns.Append(COL_ERROR_IND).Append(",")
If chkDsrNumber.Checked Then columns.Append(COL_DSR_NUM).Append(",")
If chkDsrName.Checked Then columns.Append(COL_DSR_NAME).Append(",")
If chkDsmNumber.Checked Then columns.Append(COL_DSM_NUM).Append(",")
If chkDsmName.Checked Then columns.Append(COL_DSM_NAME).Append(",")
If chkContract.Checked Then columns.Append(COL_CONTRACT).Append(",")
If chkNationalAcct.Checked Then columns.Append(COL_NA_NUM).Append(",")
If chkNatAcctSub.Checked Then columns.Append(COL_NA_SUB).Append(",")
If chkInvoiceNumber.Checked Then columns.Append(COL_INV_NUM).Append(",")
If chkAckDateTime.Checked Then columns.Append(COL_CONF_DATE).Append(",")
If chkLineItem.Checked Then columns.Append(COL_LINE_ITEMS).Append(",")
If chkDeliveryDate.Checked Then columns.Append(COL_DELV_DATE).Append(",")
If chkSalesAmount.Checked Then columns.Append(COL_SALES_AMT).Append(",")
If chkBranch.Checked Then columns.Append(COL_BRANCH).Append(",")
' remove the last comma from the list
columns = columns.Remove(columns.Length - 1, 1)
SetColumnList(columns.ToString())
SaveCookie()
ManageGridColumns()
End Sub
Private Sub btnEndDate_Click(ByVal sender As Object, ByVal e As System.Web.UI.ImageClickEventArgs) Handles btnEndDate.Click
calEndDate.Visible = Not calEndDate.Visible
If calEndDate.Visible Then
Try
calEndDate.SelectedDate = Date.Parse(txtEndDate.Text)
Catch
calEndDate.SelectedDate = Now
End Try
End If
modSearch.Show()
End Sub
Private Sub btnSearchReset_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnSearchReset.Click
ddlBranch.SelectedIndex = 0
SearchBranch = ddlBranch.SelectedValue
ddlCollectorType.SelectedIndex = 0
SearchCollector = ddlCollectorType.SelectedValue
ddlOrderType.SelectedIndex = 0
SearchOrderType = ddlOrderType.SelectedValue
ddlErrorCode.SelectedIndex = 0
SearchErrorType = ddlErrorCode.SelectedValue
SearchConfirmationNumber = String.Empty
SearchNationalAccountNumber = String.Empty
SearchCustomerNumber = String.Empty
SearchInvoiceNumber = String.Empty
SearchContract = String.Empty
SearchDsrNumber = String.Empty
'SearchDsmNumber = String.Empty
SetDsmInfo()
SearchStartDate = Now.ToShortDateString()
SearchEndDate = Now.ToShortDateString()
SaveCookie()
SetSearchWindow()
modSearch.Show()
End Sub
Private Sub btnSearchSearch_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnSearchSearch.Click
SearchBranch = ddlBranch.SelectedValue
SearchCollector = ddlCollectorType.SelectedValue
SearchConfirmationNumber = txtAckNumber.Text
SearchCustomerNumber = txtCustomerNumber.Text
SearchInvoiceNumber = txtInvoiceNumber.Text
SearchDsrNumber = txtDsrNumber.Text
SearchDsmNumber = txtDsmNumber.Text
SearchNationalAccountNumber = txtNationalAccountNumber.Text
SearchContract = txtContract.Text
SearchErrorType = ddlErrorCode.SelectedValue
SearchOrderType = ddlOrderType.SelectedValue
SearchStartDate = txtStartDate.Text
SearchEndDate = txtEndDate.Text
SaveCookie()
PageIndex = 0
dgResults.CurrentPageIndex = 0
BindResults()
End Sub
Private Sub btnStartDate_Click(ByVal sender As Object, ByVal e As System.Web.UI.ImageClickEventArgs) Handles btnStartDate.Click
calStartDate.Visible = Not calStartDate.Visible
If calStartDate.Visible Then
Try
calStartDate.SelectedDate = Date.Parse(txtStartDate.Text)
Catch
calStartDate.SelectedDate = Now
End Try
End If
modSearch.Show()
End Sub
Private Sub calEndDate_SelectionChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles calEndDate.SelectionChanged
txtEndDate.Text = calEndDate.SelectedDate.ToShortDateString()
calEndDate.Visible = False
modSearch.Show()
End Sub
Private Sub calStartDate_SelectionChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles calStartDate.SelectionChanged
txtStartDate.Text = calStartDate.SelectedDate.ToShortDateString()
calStartDate.Visible = False
modSearch.Show()
End Sub
Private Sub dgResults_PageIndexChanged(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataGridPageChangedEventArgs) Handles dgResults.PageIndexChanged
PageIndex = e.NewPageIndex
dgResults.CurrentPageIndex = e.NewPageIndex
BindResults()
End Sub
Private Sub dgResults_SortCommand(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataGridSortCommandEventArgs) Handles dgResults.SortCommand
If SortColumn.Equals(e.SortExpression) Then
If SortDirection = SORT_DIRECTION_ASC Then
SortDirection = SORT_DIRECTION_DESC
Else
SortDirection = SORT_DIRECTION_ASC
End If
Else
SortColumn = e.SortExpression
SortDirection = SORT_DIRECTION_ASC
End If
PageIndex = 0
dgResults.CurrentPageIndex = 0
BindResults()
End Sub
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If IsPostBack = False Then
SetDsmInfo()
txtStartDate.Text = Now.ToShortDateString()
txtEndDate.Text = Now.ToShortDateString()
BindBranches()
BindCollectorTypes()
BindTransmissionTypes()
BindErrorCodes()
SetupColumnWindow()
ManageGridColumns()
If HasSearchValues() Then
SetSearchWindow()
dgResults.CurrentPageIndex = CInt(PageIndex)
BindResults()
Else
modSearch.Show()
End If
End If
End Sub
#End Region
#Region "methods"
Private Sub BindBranches()
If AuthenticatedUser.IsCorporateAdmin Then
Dim branches As New BranchCollection
branches.Load()
ddlBranch.DataSource = branches
ddlBranch.DataTextField = "BranchDescription"
ddlBranch.DataValueField = "BranchName"
ddlBranch.DataBind()
Else
Dim myBranch As New Branch(AuthenticatedUser.Division)
ddlBranch.Items.Clear()
ddlBranch.Items.Add(New ListItem(myBranch.BranchDescription, myBranch.BranchName))
ddlBranch.Enabled = False
End If
End Sub
Private Sub BindCollectorTypes()
Dim types As New OrderTypeCollection
types.Load()
ddlCollectorType.DataSource = types
ddlCollectorType.DataTextField = "eb_order_description"
ddlCollectorType.DataValueField = "eb_order_type"
ddlCollectorType.DataBind()
End Sub
Private Sub BindErrorCodes()
Dim codes As New KDOE_Library.BusinessLayer.ErrorTypeCollection
codes.Load()
ddlErrorCode.DataSource = codes
ddlErrorCode.DataTextField = "eb_error_desc"
ddlErrorCode.DataValueField = "eb_error_type"
ddlErrorCode.DataBind()
End Sub
Private Sub BindResults()
Dim results As New ConfirmationHeaderCollection()
results.Search(SearchCollector, SearchConfirmationNumber, SearchBranch, SearchCustomerNumber, SearchInvoiceNumber, _
SearchDsrNumber, SearchDsmNumber, SearchNationalAccountNumber, SearchContract, SearchErrorType, _
SearchOrderType, SearchStartDate, SearchEndDate)
results.SortExpression = TranslateSortExpression(SortColumn)
results.SortDirection = IIf(SortDirection.Equals(SORT_DIRECTION_ASC), _
ConfirmationHeaderCollection.SortOrder.Ascending, _
ConfirmationHeaderCollection.SortOrder.Descending)
results.Sort(results)
dgResults.DataSource = results
dgResults.DataBind()
lblResultCount.Text = String.Format("{0} records found", results.Count.ToString("#,###,###"))
End Sub
Private Sub BindTransmissionTypes()
Dim transTypes As New TransTypeCollection
transTypes.Load()
ddlOrderType.DataSource = transTypes
ddlOrderType.DataTextField = "eb_trans_desc"
ddlOrderType.DataValueField = "eb_trans_type"
ddlOrderType.DataBind()
End Sub
Private Sub HideAllColumns()
For i As Integer = 0 To dgResults.Columns.Count - 1
dgResults.Columns(i).Visible = False
Next
End Sub
Private Sub ManageGridColumns()
HideAllColumns()
Dim columns() As String = GetColumnList()
For i As Integer = 0 To columns.Length - 1
Try
dgResults.Columns(CInt(columns(i))).Visible = True
Catch
' do nothing if an error is detected because it indicates a dirty cookie
End Try
Next
End Sub
Private Sub SetupColumnWindow()
Dim columns() As String = GetColumnList()
For i As Integer = 0 To columns.Length - 1
Try
Select Case CInt(columns(i))
Case COL_COLLECTOR
chkCollector.Checked = True
Case COL_CONF_NUM
chkAckNumber.Checked = True
Case COL_NODE_NUM
chkNodeNumber.Checked = True
Case COL_ORDER_TYPE
chkOrderType.Checked = True
Case COL_CUST_NUM
chkCustNumber.Checked = True
Case COL_CUST_NAME
chkCustName.Checked = True
Case COL_ERROR_IND
chkOrderExceptions.Checked = True
Case COL_DSR_NUM
chkDsrNumber.Checked = True
Case COL_DSR_NAME
chkDsrName.Checked = True
Case COL_DSM_NUM
chkDsmNumber.Checked = True
Case COL_DSM_NAME
chkDsmName.Checked = True
Case COL_CONTRACT
chkContract.Checked = True
Case COL_NA_NUM
chkNationalAcct.Checked = True
Case COL_NA_SUB
chkNatAcctSub.Checked = True
Case COL_INV_NUM
chkInvoiceNumber.Checked = True
Case COL_CONF_DATE
chkAckDateTime.Checked = True
Case COL_LINE_ITEMS
chkLineItem.Checked = True
Case COL_DELV_DATE
chkDeliveryDate.Checked = True
Case COL_SALES_AMT
chkSalesAmount.Checked = True
Case COL_BRANCH
chkBranch.Checked = True
Case Else
' do nothing
End Select
Catch
' do nothing because the entry is not an actual column number
' i.e. the cookie has dirty data
End Try
Next
End Sub
Private Sub SetDsmInfo()
If AuthenticatedUser.IsDsm Then
Dim theService As New DsmService.DsmService
theService.PreAuthenticate = True
theService.Credentials = New System.Net.NetworkCredential("someuser", "somepassword", "somedomain")
Dim myDsm As DsmService.Dsm = theService.GetDsmByName(AuthenticatedUser.FirstName, AuthenticatedUser.LastName)
If IsPostBack Then
SearchDsmNumber = myDsm.DsmNumber
Else
txtDsmNumber.Text = myDsm.DsmNumber
End If
txtDsmNumber.Enabled = False
Else
'txtDsmNumber.Text = String.Empty
SearchDsmNumber = String.Empty
txtDsmNumber.Enabled = True
End If
End Sub
Private Sub SetSearchWindow()
Try
ddlBranch.SelectedValue = SearchBranch
ddlCollectorType.SelectedValue = SearchCollector
txtAckNumber.Text = SearchConfirmationNumber
txtNationalAccountNumber.Text = SearchNationalAccountNumber
txtCustomerNumber.Text = SearchCustomerNumber
txtInvoiceNumber.Text = SearchInvoiceNumber
txtContract.Text = SearchContract
ddlOrderType.SelectedValue = SearchOrderType
txtDsrNumber.Text = SearchDsrNumber
txtDsmNumber.Text = SearchDsmNumber
ddlErrorCode.SelectedValue = SearchErrorType
txtStartDate.Text = SearchStartDate
calStartDate.SelectedDate = CDate(SearchStartDate)
txtEndDate.Text = SearchEndDate
calEndDate.SelectedDate = CDate(SearchEndDate)
Catch
' do nothing because an error would be caused by dirty data from the cookie
End Try
End Sub
Private Function TranslateSortExpression(ByVal SortExpression As String) As ConfirmationHeaderCollection.SortColumn
Dim retVal As ConfirmationHeaderCollection.SortColumn = ConfirmationHeaderCollection.SortColumn.eback_datetime
Select Case SortExpression
Case "ebcollector"
retVal = ConfirmationHeaderCollection.SortColumn.ebcollector
Case "eback"
retVal = ConfirmationHeaderCollection.SortColumn.eback
Case "ebnode"
retVal = ConfirmationHeaderCollection.SortColumn.ebnode
Case "ebordertype"
retVal = ConfirmationHeaderCollection.SortColumn.ebordertype
Case "ebcust"
retVal = ConfirmationHeaderCollection.SortColumn.ebcust
Case "CustomerName"
retVal = ConfirmationHeaderCollection.SortColumn.CustomerName
Case "eberror"
retVal = ConfirmationHeaderCollection.SortColumn.eberror
Case "ebslm"
retVal = ConfirmationHeaderCollection.SortColumn.ebslm
Case "DsrName"
retVal = ConfirmationHeaderCollection.SortColumn.DsrName
Case "DsmNumber"
retVal = ConfirmationHeaderCollection.SortColumn.DsmNumber
Case "DsmName"
retVal = ConfirmationHeaderCollection.SortColumn.DsmName
Case "ebcontract"
retVal = ConfirmationHeaderCollection.SortColumn.ebcontract
Case "ebna"
retVal = ConfirmationHeaderCollection.SortColumn.ebna
Case "ebnasub"

Answer 1

I think that I have found the answer. The cookie hasn't been removed in a while, so this looks like it. I tried several other things trying to find the issue, and I had finally given up on finding the solution by tweaking my code, so I took to the internet. It was on MS's website that I found this little gem.
If you do not set the cookie's expiration, the cookie is created but it is not stored on the user's hard disk. Instead, the cookie is maintained as part of the user's session information. When the user closes the browser, the cookie is discarded. A non-persistent cookie like this is useful for information that needs to be stored for only a short time or that for security reasons should not be written to disk on the client computer. For example, non-persistent cookies are useful if the user is working on a public computer, where you do not want to write the cookie to disk.
http://msdn.microsoft.com/en-us/library/ms178194.aspx
So the issue here is the fact that the cookie has an expiration date when the cookie is initially created. However, reading the cookie from the Request object does not include the expiration date. So, I fixed it by setting the expiration date before adding the cookie back to the Response object.