Neither a DataColumn nor a DataRelation - asp.net error - asp.net

Question

I'm getting this error:
banner_flag is neither a DataColumn nor a DataRelation for table temp
After searching, the error is apparently appearing because I'm referencing banner_flag, but it doesn't exist, but I've declared it in all the same places as intra_user (As an example).
Below is my code, any help is greatly appreciated. Thanks!:
Dim reason As String = ""
Dim banner_action As String = ""
Dim esr_link As String = ""
Dim seen_message AS String = ""
Dim last_updated AS String = ""
Dim daysSinceUpdated As Integer
Dim intra_user As String = ""
Dim banner_flag As String = ""
Sub Page_Load(ByVal Sender As Object, ByVal e As EventArgs)
Dim sc As Web.HttpContext = Web.HttpContext.Current
Dim updatePeriod As Integer = 90
Dim strConn As String = getStrConn(sc)
Dim rst As DataView
Dim strsql, last_updated, email_address As String
Dim update_required As String = ""
' - Really don't know what this is for... so I have commented it out.
' - Response.Write("<br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />hello no details")
' Check users last update to their email address
strsql = "select last_updated, email, esr_link, intra_user, banner_action, seen_message from user_group where id = " & Session("u_id") & " AND (esr_link <> 5)"
rst = GetDefaultView(strsql, strConn)
If (rst.count > 0) Then
' Get details for new banner check for launching windows at startup
If Not IsDBNull(rst(0)("banner_action")) Then
banner_action = rst(0)("banner_action").ToString
Else
banner_action = ""
End If
' Get details for seen message
If Not IsDBNull(rst(0)("seen_message")) Then
seen_message = rst(0)("seen_message").ToString
Else
seen_message = ""
End If
' Gets banner_flag value
If Not IsDBNull(rst(0)("banner_flag")) Then
banner_flag = rst(0)("banner_flag").ToString
Else
banner_flag = ""
End If
' Gets the ESR link value to check if the New User code needs to run
If Not IsDBNull(rst(0)("esr_link")) Then
esr_link = rst(0)("esr_link").ToString
Else
esr_link = ""
End If
' Gets the intra_user value
If Not IsDBNull(rst(0)("intra_user")) Then
intra_user = rst(0)("intra_user").ToString
Else
intra_user = ""
End If
' Grab users last_updated value if available
If Not IsDBNull(rst(0)("last_updated")) Then
last_updated = rst(0)("last_updated").ToString
Else
last_updated = ""
End If
' Grab users email address if available
If Not IsDBNull(rst(0)("email")) Then
email_address = rst(0)("email").ToString
email_address = Replace(email_address, "'", "")
Else
email_address = ""
End If
'Checks the email address to see if it is valid
If email_address <> "" Then
If IsEmailValid(email_address) = False Then
update_required = "true"
reason = "Your current Email address is invalid please update it." & vbCrLf
End If
Else
update_required = "true"
reason = "You have not entered a current Email address please add one." & vbCrLf
End If
'If it not empty then compare
If last_updated <> "" Then
last_updated = CDate(last_updated)
daysSinceUpdated = DateDiff("d", last_updated, Now())
If daysSinceUpdated > updatePeriod Then
update_required = "true"
reason &= "Your details have expired please check them to ensure they are up-to-date" & vbCrLf
End If
'If it empty then needs updating...
Else
update_required = "true"
reason = "Your details have expired please check them to ensure they are up-to-date" & vbCrLf
End If
rst.Dispose()
rst = Nothing
Session("checked_details") = "true"
If update_required = "true" Then
reason = Server.UrlEncode(reason)
'response.write(reason)
'Response.Write("<scr" & "ipt language='javascript'>findTop().submitURL('/sorce/app_centre/launch_form.aspx?fhandle=User_Details_Amendment&elemid=" & Session("u_id") & "&reason=" & reason & "');</scr" & "ipt>")
End If
Else
'Response.Write("<br /><br /><br /><br /><br /><br />hello details")
'Response.Write("<scr" & "ipt language='javascript'>findTop().submitURL('/sorce/app_centre/launch_form.aspx?fhandle=User_Details_Amendment&elemid=" & Session("u_id") & "&reason=" & reason & "');</scr" & "ipt>")
End If
End Sub
Function IsEmailValid(ByVal strEmail As String) As Boolean
Dim strArray() As String
Dim strItem As String
Dim i As Integer
Dim c As String
Dim blnIsItValid As Boolean
' assume the email address is correct
blnIsItValid = True
' split the email address in two parts: name#domain.ext
strArray = Split(strEmail, "#")
' if there are more or less than two parts
If UBound(strArray) <> 1 Then
blnIsItValid = False
IsEmailValid = blnIsItValid
Exit Function
End If
' check each part
For Each strItem In strArray
' no part can be void
If Len(strItem) <= 0 Then
blnIsItValid = False
IsEmailValid = blnIsItValid
Exit Function
End If
' check each character of the part
' only following "abcdefghijklmnopqrstuvwxyz_-."
' characters and the ten digits are allowed
For i = 1 To Len(strItem)
c = LCase(Mid(strItem, i, 1))
' if there is an illegal character in the part
If InStr("abcdefghijklmnopqrstuvwxyz_-.", c) <= 0 And Not IsNumeric(c) Then
blnIsItValid = False
IsEmailValid = blnIsItValid
Exit Function
End If
Next
' the first and the last character in the part cannot be . (dot)
If Left(strItem, 1) = "." Or Right(strItem, 1) = "." Then
blnIsItValid = False
IsEmailValid = blnIsItValid
Exit Function
End If
Next
' the second part (domain.ext) must contain a . (dot)
If InStr(strArray(1), ".") <= 0 Then
blnIsItValid = False
IsEmailValid = blnIsItValid
Exit Function
End If
' check the length oh the extension
i = Len(strArray(1)) - InStrRev(strArray(1), ".")
' the length of the extension can be only 2, 3, or 4
' to cover the new "info" extension
If i <> 2 And i <> 3 And i <> 4 Then
blnIsItValid = False
IsEmailValid = blnIsItValid
Exit Function
End If
' after . (dot) cannot follow a . (dot)
If InStr(strEmail, "..") > 0 Then
blnIsItValid = False
IsEmailValid = blnIsItValid
Exit Function
End If
' finally it's OK
IsEmailValid = blnIsItValid
End Function

Answer 1

Your sql statement is:
select last_updated, email, esr_link, intra_user, banner_action, seen_message from user_group where ...
Therefore there will be a column in the returned DataView for intra_user, which is present in the sql select, but not banner_flag, which is not present.