How to bind ArrayList to WinForms ComboBox AutoComplete?

private void Form1_Load(object sender, EventArgs e)
{
     this.alphaList.AddRange(new String[]{"A","B","C","D","E"});
     foreach (string s in this.alphaList)
     {
          for (int i = 0; i < 5; i++)
          {
              this.itemsList.Add(s + i.ToString());
          }
     }
     this.comboBoxAutoComplete1.AutoCompleteControl.DataSource = this.itemsList;
     this.comboBoxAutoComplete1.DropDownWidth = this.comboBoxAutoComplete1.Width; 
}

Private Sub Form1_Load(sender As Object, e As EventArgs)
     Me.alphaList.AddRange(New [String]() {"A", "B", "C", "D", "E"})
     For Each s As String In Me.alphaList
          For i As Integer = 0 To 4
              Me.itemsList.Add(s & i.ToString())
          Next
     Next
     Me.comboBoxAutoComplete1.AutoCompleteControl.DataSource = Me.itemsList
     Me.comboBoxAutoComplete1.DropDownWidth = Me.comboBoxAutoComplete1.Width
End Sub