Remplir une ComboBox VB.NET à partir d'une colonne Excel

Bonjour! Suite a mon poste d'hier sur l'ouverture et fermeture de formulaire en VB.NET de fichier, je m'attaque maintenant a un autre problème... celle du remplissage de la combobox à partir d'une colonne Excel.

Mon problème est que j'obtiens plusieurs erreur au niveaux des différentes Dim et que je pense que je me suis bien emmêler les pinceaux.... :koi:
Voici ci-dessous mon avancement sur mes 2 formulaires:

Code:

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Imports Microsoft.Office.Interop.Excel
 
Public Class Form1
    Public Property ExcelApp As Application
    Public Property ExcelWorkBook As Workbook
 
    Private Sub Browse1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Browse1.Click
        ofd.Filter = "Excel Files(.xls)|*.xls|Excel Files(.xlsx)|*.xlsx|Excel Files(*.xlsm)|*.xlsm"
        If (ofd.ShowDialog() = DialogResult.OK) Then
            TextBox1.Text = ofd.FileName
        End If
    End Sub
 
    Private Sub Comfirm1_Click(sender As Object, e As EventArgs) Handles Comfirm1.Click
        If TextBox1.Text = "" Then
            MessageBox.Show("Wait!", "Please pick your file first!", MessageBoxButtons.OKCancel)
        Else
            ExcelApp = New Application
            ExcelWorkBook = ExcelApp.Workbooks.Open(TextBox1.Text)
            ExcelApp.Visible = False
            ExcelWorkBook.Activate()
            Dim FinderForm As New Form2(ExcelApp)
            FinderForm.Show()
            Me.Hide()
        End If
    End Sub
End Class

Code:

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Imports Microsoft.Office.Interop.Excel
 
Public Class Form2
    Property ExcelApp As Application
    Property ExcelWorkBook As Workbook
 
    Sub New(ByRef App As Application)
        InitializeComponent()
        ExcelApp = App
    End Sub
 
    Private Sub BBack_Click(sender As Object, e As EventArgs) Handles BBack.Click
        ExcelApp.Quit()
        System.Runtime.InteropServices.Marshal.ReleaseComObject(ExcelApp)
        ExcelApp = Nothing
        Form1.Show()
        Me.Close()
    End Sub
 
    Private Function GetDataFromExcelByCom(ByVal Optional hasTitle As Boolean = False) As DataTable
        Dim sheets As ExcelApp.Sheets
        Dim oMissiong As Object = System.Reflection.Missing.Value
        Dim workbook As ExcelWorkbook = Nothing
        Dim dt As DataTable = New DataTable()
 
        Try
            If ExcelApp Is Nothing Then Return Nothing
            workbook = ExcelApp.Workbooks.Open(excelFilePath, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong, oMissiong)
            sheets = workbook.Worksheets
            Dim worksheet As ExcelApp.Worksheet = sheets(1)
            Dim ji As Integer = CType(12, Integer)
            If worksheet Is Nothing Then Return Nothing
            Dim iRowCount As Integer = worksheet.UsedRange.Rows.Count
            Dim iColCount As Integer = worksheet.UsedRange.Columns.Count
 
            For i As Integer = 0 To iColCount - 1
                Dim name = "column" & i
 
                If hasTitle Then
                    Dim txt = (CType(worksheet.Cells(1, i + 1), ExcelApp.Range)).Text.ToString()
                    If Not String.IsNullOrWhiteSpace(txt) Then name = txt
                End If
 
                While dt.Columns.Contains(name)
                    name = name & "_1"
                End While
 
                dt.Columns.Add(New DataColumn(name, GetType(String)))
            Next
 
            Dim range As ExcelApp.Range
            Dim rowIdx As Integer = If(hasTitle, 2, 1)
 
            For iRow As Integer = rowIdx To iRowCount
                Dim dr As DataRow = dt.NewRow()
 
                For iCol As Integer = 1 To iColCount
                    range = CType(worksheet.Cells(iRow, iCol), ExcelApp.Range)
                    dr(iCol - 1) = If((range.Value2 Is Nothing), "", range.Text.ToString())
                Next
 
                dt.Rows.Add(dr)
            Next
 
            Return dt
        Catch
            Return Nothing
        Finally
            workbook.Close(False, oMissiong, oMissiong)
            System.Runtime.InteropServices.Marshal.ReleaseComObject(workbook)
            workbook = Nothing
            ExcelWorkBook.Close()
            ExcelWorkBook = Nothing
        End Try
    End Function
 
    Private Sub ComboBox1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ComboBox1.SelectedIndexChanged
 
 
    End Sub
    Private Sub ComboBox2_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ComboBox2.SelectedIndexChanged
 
    End Sub
    Private Sub ComboBox3_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ComboBox3.SelectedIndexChanged
 
    End Sub
    Private Sub ComboBox4_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ComboBox4.SelectedIndexChanged
 
    End Sub
    Private Sub ComboBox5_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ComboBox5.SelectedIndexChanged
 
    End Sub
    Private Sub ComboBox6_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ComboBox6.SelectedIndexChanged
 
    End Sub
 
End Class

Merci d'avance pour toute remarques/aides pouvant m'aider à apprendre plus.

PS: Ci-joint le dossier du projet pour compiler.
Pièce jointe 394118