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How to correctly find an array control ?

Posted on 2010-09-16
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Last Modified: 2012-08-14
HI

I have created in  Public Sub InstantiateIn(ByVal container As System.Web.UI.Control)  event an array like this:
Dim lblcontrols(15) As Label

and I and I have instantiated from Item_DataBinding event, as follows:
CType(ph.FindControl("lblcontrols(1)"), Label).Text = "some text"

but I got an error about to "non referenced control"

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Question by:dimensionav
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LVL 17

Expert Comment

by:Zhaolai
ID: 33695707
When you declare the array in one event, it has a scope for just that event ONLY. Any other event can't see it.
 
 You need to declare the array in the class level, so that all the events (and subs, functions)  in that class can reference it, like this:
 

Partial Public Class _Default

    Inherits System.Web.UI.Page

    Dim lblcontrols(15) As Label

    

    Public Sub InstantiateIn(ByVal container As System.Web.UI.Control)



    End Sub

End Class

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Author Comment

by:dimensionav
ID: 33696129
I believe this is more complex than I thought, I have attached some code, please notice that the 4 groups of commented sections were working but the idea of my question was because I wanted to optimize that code.

Regards!
<%@ Page Language="VB" MasterPageFile="menu_principal.master" Title="Untitled Page" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="system.Data.OleDb" %>

<script runat="server">
    Public Class CustomTemplate
        Implements System.Web.UI.ITemplate

        Dim templateType As ListItemType

        Sub New(ByVal type As ListItemType)
            templateType = type
        End Sub
        
        
        Public Sub InstantiateIn(ByVal container As System.Web.UI.Control) _
          Implements System.Web.UI.ITemplate.InstantiateIn

            Dim ph As New PlaceHolder()
            'Dim campo1, campo2, campo3, campo4, campo5, campo6, campo7, campo8, campo9, campo10, _
            '    campo11, campo12, campo13, campo14, campo15 As New Label()
            'Dim valor1, valor2, valor3, valor4, valor5, valor6, valor7, valor8, valor9, valor10, _
            '    valor11, valor12, valor13, valor14, valor15 As New Label()
            
            Dim campos(15) As Label
            Dim valores(15) As Label

            Dim lblcampo As Label
            Dim lblvalor As Label
            For i As Short = 1 To 15
                lblcampo = New Label
                lblvalor = New Label
                lblcampo.ID = "campo" & i.ToString
                lblvalor.ID = "valor" & i.ToString
                campos(i) = lblcampo
                valores(i) = lblvalor
            Next
            
            'campo1.ID = "campo1"
            'campo2.ID = "campo2"
            'campo3.ID = "campo3"
            'campo4.ID = "campo4"
            'campo5.ID = "campo5"
            'campo6.ID = "campo6"
            'campo7.ID = "campo7"
            'campo8.ID = "campo8"
            'campo9.ID = "campo9"
            'campo10.ID = "campo10"
            'campo11.ID = "campo11"
            'campo12.ID = "campo12"
            'campo13.ID = "campo13"
            'campo14.ID = "campo14"
            'campo15.ID = "campo15"
            'valor1.ID = "valor1"
            'valor2.ID = "valor2"
            'valor3.ID = "valor3"
            'valor4.ID = "valor4"
            'valor5.ID = "valor5"
            'valor6.ID = "valor6"
            'valor7.ID = "valor7"
            'valor8.ID = "valor8"
            'valor9.ID = "valor9"
            'valor10.ID = "valor10"
            'valor11.ID = "valor11"
            'valor12.ID = "valor12"
            'valor13.ID = "valor13"
            'valor14.ID = "valor14"
            'valor15.ID = "valor15"

            Select Case (templateType)
                Case ListItemType.Item
                    ph.Controls.Add(New LiteralControl( _
                      "<table width=""270"" border=""0"" cellspacing=""0"" cellpadding=""0"">" & _
                      "<tr><td height=""150"" align=""center"" valign=""middle"" bgcolor=""#CCCCCC""><img src=""imagenes/3.png"" width=""270"" height=""120"" /></td>" & _
                      "</tr>" & _
                      "<tr>" & _
                        "<td height=""80"" align=""center"" valign=""top"" bgcolor=""909090"">" & _
                        "<table width=""270"" border=""0"" cellspacing=""0"" cellpadding=""0"" bgcolor=""#909090"">" & _
                          "<tr>" & _
                            "<td width=""15"" height=""30"">&nbsp;</td>" & _
                            "<td height=""30"" align=""right"" valign=""middle"" class=""inicio""><a href=""#"" class=""ficha""> Ver Galería</a></td>" & _
                            "<td width=""18"" height=""30"">&nbsp;</td>" & _
                          "</tr>" & _
                          "<tr>" & _
                            "<td width=""15"" height=""50"">&nbsp;</td>" & _
                            "<td align=""right"" valign=""top"" class=""categorias"">" & _
                              "<table width=""100%"" border=""0"">" & _
                                "<tr>"))

                        
                    ph.Controls.Add(New LiteralControl("<tr><td width=""30"" align=""right"" class=""categorias"">"))
                    ph.Controls.Add(campos(1))
                    ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    ph.Controls.Add(valores(1))
                    ph.Controls.Add(New LiteralControl("</td></tr>"))

                    ph.Controls.Add(New LiteralControl("<tr><td align=""right"" class=""categorias"">"))
                    ph.Controls.Add(campos(2))
                    ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    ph.Controls.Add(valores(2))
                    ph.Controls.Add(New LiteralControl("</td></tr>"))

                    ph.Controls.Add(New LiteralControl("<tr><td align=""right"" class=""categorias"">"))
                    ph.Controls.Add(campos(3))
                    ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    ph.Controls.Add(valores(3))
                    ph.Controls.Add(New LiteralControl("</td></tr>"))

                    ph.Controls.Add(New LiteralControl("<tr><td align=""right"" class=""categorias"">"))
                    ph.Controls.Add(campos(4))
                    ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    ph.Controls.Add(valores(4))
                    ph.Controls.Add(New LiteralControl("</td></tr>"))

                    ph.Controls.Add(New LiteralControl("<tr><td align=""right"" class=""categorias"">"))
                    ph.Controls.Add(campos(5))
                    ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    ph.Controls.Add(valores(5))
                    ph.Controls.Add(New LiteralControl("</td></tr>"))

                    ph.Controls.Add(New LiteralControl("<tr><td align=""right"" class=""categorias"">"))
                    ph.Controls.Add(campos(6))
                    ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    ph.Controls.Add(valores(6))
                    ph.Controls.Add(New LiteralControl("</td></tr>"))

                    ph.Controls.Add(New LiteralControl("<tr><td align=""right"" class=""categorias"">"))
                    ph.Controls.Add(campos(7))
                    ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    ph.Controls.Add(valores(7))
                    ph.Controls.Add(New LiteralControl("</td></tr>"))

                    ph.Controls.Add(New LiteralControl("<tr><td align=""right"" class=""categorias"">"))
                    ph.Controls.Add(campos(8))
                    ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    ph.Controls.Add(valores(8))
                    ph.Controls.Add(New LiteralControl("</td></tr>"))

                    ph.Controls.Add(New LiteralControl("<tr><td align=""right"" class=""categorias"">"))
                    ph.Controls.Add(campos(9))
                    ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    ph.Controls.Add(valores(9))
                    ph.Controls.Add(New LiteralControl("</td></tr>"))

                    ph.Controls.Add(New LiteralControl("<tr><td align=""right"" class=""categorias"">"))
                    ph.Controls.Add(campos(10))
                    ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    ph.Controls.Add(valores(10))
                    ph.Controls.Add(New LiteralControl("</td></tr>"))

                    ph.Controls.Add(New LiteralControl("<tr><td align=""right"" class=""categorias"">"))
                    ph.Controls.Add(campos(11))
                    ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    ph.Controls.Add(valores(11))
                    ph.Controls.Add(New LiteralControl("</td></tr>"))

                    ph.Controls.Add(New LiteralControl("<tr><td align=""right"" class=""categorias"">"))
                    ph.Controls.Add(campos(12))
                    ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    ph.Controls.Add(valores(12))
                    ph.Controls.Add(New LiteralControl("</td></tr>"))

                    ph.Controls.Add(New LiteralControl("<tr><td align=""right"" class=""categorias"">"))
                    ph.Controls.Add(campos(13))
                    ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    ph.Controls.Add(valores(13))
                    ph.Controls.Add(New LiteralControl("</td></tr>"))

                    ph.Controls.Add(New LiteralControl("<tr><td align=""right"" class=""categorias"">"))
                    ph.Controls.Add(campos(14))
                    ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    ph.Controls.Add(valores(14))
                    ph.Controls.Add(New LiteralControl("</td></tr>"))

                    ph.Controls.Add(New LiteralControl("<tr><td align=""right"" class=""categorias"">"))
                    ph.Controls.Add(campos(15))
                    ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    ph.Controls.Add(valores(15))
                    ph.Controls.Add(New LiteralControl("</td></tr>"))

                    
                    
                    'ph.Controls.Add(New LiteralControl("<tr><td width=""30"" align=""right"" class=""categorias"">"))
                    'ph.Controls.Add(campo1)
                    'ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    'ph.Controls.Add(valor1)
                    'ph.Controls.Add(New LiteralControl("</td></tr>"))

                    'ph.Controls.Add(New LiteralControl("<tr><td align=""right"" class=""categorias"">"))
                    'ph.Controls.Add(campo2)
                    'ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    'ph.Controls.Add(valor2)
                    'ph.Controls.Add(New LiteralControl("</td></tr>"))

                    'ph.Controls.Add(New LiteralControl("<tr><td align=""right"" class=""categorias"">"))
                    'ph.Controls.Add(campo3)
                    'ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    'ph.Controls.Add(valor3)
                    'ph.Controls.Add(New LiteralControl("</td></tr>"))

                    'ph.Controls.Add(New LiteralControl("<tr><td align=""right"" class=""categorias"">"))
                    'ph.Controls.Add(campo4)
                    'ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    'ph.Controls.Add(valor4)
                    'ph.Controls.Add(New LiteralControl("</td></tr>"))

                    'ph.Controls.Add(New LiteralControl("<tr><td align=""right"" class=""categorias"">"))
                    'ph.Controls.Add(campo5)
                    'ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    'ph.Controls.Add(valor5)
                    'ph.Controls.Add(New LiteralControl("</td></tr>"))

                    'ph.Controls.Add(New LiteralControl("<tr><td align=""right"" class=""categorias"">"))
                    'ph.Controls.Add(campo6)
                    'ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    'ph.Controls.Add(valor6)
                    'ph.Controls.Add(New LiteralControl("</td></tr>"))

                    'ph.Controls.Add(New LiteralControl("<tr><td align=""right"" class=""categorias"">"))
                    'ph.Controls.Add(campo7)
                    'ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    'ph.Controls.Add(valor7)
                    'ph.Controls.Add(New LiteralControl("</td></tr>"))

                    'ph.Controls.Add(New LiteralControl("<tr><td align=""right"" class=""categorias"">"))
                    'ph.Controls.Add(campo8)
                    'ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    'ph.Controls.Add(valor8)
                    'ph.Controls.Add(New LiteralControl("</td></tr>"))

                    'ph.Controls.Add(New LiteralControl("<tr><td align=""right"" class=""categorias"">"))
                    'ph.Controls.Add(campo9)
                    'ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    'ph.Controls.Add(valor9)
                    'ph.Controls.Add(New LiteralControl("</td></tr>"))

                    'ph.Controls.Add(New LiteralControl("<tr><td align=""right"" class=""categorias"">"))
                    'ph.Controls.Add(campo10)
                    'ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    'ph.Controls.Add(valor10)
                    'ph.Controls.Add(New LiteralControl("</td></tr>"))

                    'ph.Controls.Add(New LiteralControl("<tr><td align=""right"" class=""categorias"">"))
                    'ph.Controls.Add(campo11)
                    'ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    'ph.Controls.Add(valor11)
                    'ph.Controls.Add(New LiteralControl("</td></tr>"))

                    'ph.Controls.Add(New LiteralControl("<tr><td align=""right"" class=""categorias"">"))
                    'ph.Controls.Add(campo12)
                    'ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    'ph.Controls.Add(valor12)
                    'ph.Controls.Add(New LiteralControl("</td></tr>"))

                    'ph.Controls.Add(New LiteralControl("<tr><td align=""right"" class=""categorias"">"))
                    'ph.Controls.Add(campo13)
                    'ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    'ph.Controls.Add(valor13)
                    'ph.Controls.Add(New LiteralControl("</td></tr>"))

                    'ph.Controls.Add(New LiteralControl("<tr><td align=""right"" class=""categorias"">"))
                    'ph.Controls.Add(campo14)
                    'ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    'ph.Controls.Add(valor14)
                    'ph.Controls.Add(New LiteralControl("</td></tr>"))

                    'ph.Controls.Add(New LiteralControl("<tr><td align=""right"" class=""categorias"">"))
                    'ph.Controls.Add(campo15)
                    'ph.Controls.Add(New LiteralControl("</td><td width=""13"">&nbsp;</td><td align=""left"" class=""info"">"))
                    'ph.Controls.Add(valor15)
                    'ph.Controls.Add(New LiteralControl("</td></tr>"))
                    
                    

                    ph.Controls.Add(New LiteralControl( _
                        "</table>" & _
                              "<br /></td>" & _
                            "<td width=""18"">&nbsp;</td>" & _
                          "</tr>" & _
                          "<tr>" & _
                            "<td height=""10"">&nbsp;</td>" & _
                            "<td height=""30"" align=""right"" valign=""middle"" class=""info""><a href=""#"" class=""ficha"">Descarga ficha técnica</a></td>" & _
                            "<td>&nbsp;</td>" & _
                          "</tr>" & _
                        "</table>" & _
                        "</td>" & _
                      "</tr>" & _
                    "</table>"))
                       
                    AddHandler ph.DataBinding, New EventHandler(AddressOf Item_DataBinding)
            End Select

            container.Controls.Add(ph)
        End Sub
    End Class
        
    Shared Sub Item_DataBinding(ByVal sender As Object, ByVal e As System.EventArgs)
        Dim ph As PlaceHolder = CType(sender, PlaceHolder)
        Dim ri As DataListItem = CType(ph.NamingContainer, DataListItem)

        For i As Integer = 1 To 15
            Dim titulocampo As String = "CAMPO" & i.ToString
            Dim titulovalor As String = "VALOR" & i.ToString
            
            Dim campo As String = Convert.ToString(DataBinder.Eval(ri.DataItem, titulocampo))
            Dim valor As String = Convert.ToString(DataBinder.Eval(ri.DataItem, titulovalor))
                
            Dim ctrlcampo As String = "campos(" & i.ToString & ")"
            Dim ctrlvalor As String = "valores(" & i.ToString & ")"

            CType(ph.FindControl(ctrlcampo), Label).Text = campo
            CType(ph.FindControl(ctrlvalor), Label).Text = valor
        Next
            
    End Sub
        
    'Shared Sub Item_DataBinding(ByVal sender As Object, ByVal e As System.EventArgs)
    '    Dim ph As PlaceHolder = CType(sender, PlaceHolder)
    '    Dim ri As DataListItem = CType(ph.NamingContainer, DataListItem)

    '    For i As Integer = 1 To 15
    '        Dim titulocampo As String = "CAMPO" & i.ToString
    '        Dim titulovalor As String = "VALOR" & i.ToString

    '        Dim campo As String = Convert.ToString(DataBinder.Eval(ri.DataItem, titulocampo))
    '        Dim valor As String = Convert.ToString(DataBinder.Eval(ri.DataItem, titulovalor))

    '        CType(ph.FindControl(titulocampo), Label).Text = campo
    '        CType(ph.FindControl(titulovalor), Label).Text = valor
    '    Next

    'End Sub

    
    
    Protected Sub Page_Load(ByVal sender As Object, _
        ByVal e As System.EventArgs) Handles MyBase.Load

        Dim conn As OleDbConnection ' Archivo
        Dim ComandoLectura As OleDbDataAdapter ' SQL
        Dim LineaSQL As String
            
        'Establecer conexion
        conn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0; Data Source=|DataDirectory|demo.mdb;")           
        LineaSQL = "SELECT Secciones.SECCION, Categorias.CATEGORIA, ProductosUsados.PRECIO, ProductosUsados.MONEDA, ProductosUsados.IVA, " & _
                   "ProductosUsadosCampos.CAMPO1, ProductosUsados.VALOR1, ProductosUsadosCampos.CAMPO2, ProductosUsados.VALOR2, " & _
                   "ProductosUsadosCampos.CAMPO3, ProductosUsados.VALOR3, ProductosUsadosCampos.CAMPO4, ProductosUsados.VALOR4, " & _
                   "ProductosUsadosCampos.CAMPO5, ProductosUsados.VALOR5, ProductosUsadosCampos.CAMPO6, ProductosUsados.VALOR6, " & _
                   "ProductosUsadosCampos.CAMPO7, ProductosUsados.VALOR7, ProductosUsadosCampos.CAMPO8, ProductosUsados.VALOR8, " & _
                   "ProductosUsadosCampos.CAMPO9, ProductosUsados.VALOR9, ProductosUsadosCampos.CAMPO10, ProductosUsados.VALOR10, " & _
                   "ProductosUsadosCampos.CAMPO11, ProductosUsados.VALOR11, ProductosUsadosCampos.CAMPO12, ProductosUsados.VALOR12, " & _
                   "ProductosUsadosCampos.CAMPO13, ProductosUsados.VALOR13, ProductosUsadosCampos.CAMPO14, ProductosUsados.VALOR14, " & _
                   "ProductosUsadosCampos.CAMPO15, ProductosUsados.VALOR15 " & _
                   "FROM (Secciones INNER JOIN (Categorias INNER JOIN ProductosUsados ON Categorias.ID_CATEGORIA = ProductosUsados.ID_CATEGORIA) " & _
                   "ON Secciones.ID_SECCION = ProductosUsados.ID_SECCION) INNER JOIN ProductosUsadosCampos ON Secciones.ID_SECCION = ProductosUsadosCampos.ID_SECCION"

            
        ComandoLectura = New OleDbDataAdapter(LineaSQL, conn)
        Dim Tabla As DataTable = New DataTable

        'dlProductos.HeaderTemplate = New CustomTemplate(ListItemType.Header)
        dlProductos.ItemTemplate = New CustomTemplate(ListItemType.Item)
        'dlProductos.AlternatingItemTemplate = New CustomTemplate(ListItemType.AlternatingItem)
        'dlProductos.FooterTemplate = New CustomTemplate(ListItemType.Footer)
        ComandoLectura.Fill(Tabla)

        'Ordenar la estructura de datos
        dlProductos.DataSource = Tabla
        dlProductos.DataBind()

    End Sub


    </script>

<asp:Content ID="Content1" ContentPlaceHolderID="cphProductos" Runat="Server">
        <asp:datalist ID="dlProductos" runat="server" CellPadding="0" CellSpacing="12"
                      RepeatColumns="3" RepeatDirection="Horizontal" BorderWidth="0px" 
                      HorizontalAlign="Left" ShowFooter="False" ShowHeader="False">
        </asp:datalist>                    
</asp:Content>

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LVL 17

Assisted Solution

by:Zhaolai
Zhaolai earned 500 total points
ID: 33696649
Try this, which is the same as the one you commented out, because you are trying to find the labels with IDs.

    Shared Sub Item_DataBinding(ByVal sender As Object, ByVal e As System.EventArgs)

        Dim ph As PlaceHolder = CType(sender, PlaceHolder)

        Dim ri As DataListItem = CType(ph.NamingContainer, DataListItem)



        For i As Integer = 1 To 15

            Dim titulocampo As String = "CAMPO" & i.ToString

            Dim titulovalor As String = "VALOR" & i.ToString



            Dim campo As String = Convert.ToString(DataBinder.Eval(ri.DataItem, titulocampo))

            Dim valor As String = Convert.ToString(DataBinder.Eval(ri.DataItem, titulovalor))



            CType(ph.FindControl(titulocampo), Label).Text = campo

            CType(ph.FindControl(titulovalor), Label).Text = valor

        Next



    End Sub

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Author Comment

by:dimensionav
ID: 33696718
It worked but I am a littlebit confused because ID´s of controls are small letters while the method is searching for capital letters.
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LVL 17

Accepted Solution

by:
Zhaolai earned 500 total points
ID: 33696777
I believe that the IDs are case insensitive.
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