Find control issue

[Mosteck]

I've got a ASP.NET application that has 100 dropdown list boxes.. I need to populate all 100 dropdown list boxes with the same data that I'm extracting from a MS Access database..

The code I'm using is:

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

        objCmdPartNumber = New OleDbCommand("SELECT ProductPartNumber, ProductDescription FROM ProductHierarchy ORDER BY ProductPartNumber ASC", objConPartNumber)
        objConPartNumber.Open()
        objDRPartNumber = objCmdPartNumber.ExecuteReader

        Dim DropDownListData As String = ""
        Dim DropDownListCount As Integer = 0
        Dim DropDownListCurrent As String = ""

        While objDRPartNumber.Read()

            DropDownListData = ""

            If Len(objDRPartNumber("ProductDescription")) <= 70 Then
                DropDownListData = objDRPartNumber("ProductPartNumber") & " - " & objDRPartNumber("ProductDescription")
            Else
                DropDownListData = objDRPartNumber("ProductPartNumber") & " - " & Mid(objDRPartNumber("ProductDescription"), 1, 70) & "...."
            End If

            For DropDownListCount = 1 To 100
                CType(Me.Page.FindControl("Item" & DropDownListCount.ToString & "PartNumberDropDownList"), DropDownList).Items.Add(DropDownListData)
            Next

        End While

        objConPartNumber.Close()

    End Sub

The dropdown list boxes are names Item1PartNumberDropDownList to Item 100PartNumberDropDownList...

I get the following error:

System.NullReferenceException was unhandled by user code
Message="Object reference not set to an instance of an object."
Source="App_Web_l09mpxf_"
StackTrace:
at ContentListCreate.Page_Load(Object sender, EventArgs e) in C:\ESWCIMS\ContentListCreate.aspx.vb:line 39
at System.Web.UI.Control.OnLoad(EventArgs e)
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
InnerException:

Line 39 is CType(Me.Page.FindControl("Item" & DropDownListCount.ToString & "PartNumberDropDownList"), DropDownList).Items.Add(DropDownListData)

Can anyone assist with this please?