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VS 2008 Nedd help on vb.nets database code instead of older vb6.0

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I had been used to using the convention of the older VB 6.0 database connections and code. I have been told to start using the new conventions , so I have anew project I'm starting and I need some help.
In the code below I have loaded data into to combo boxes. but you will see how I changed the naming for the variables in the second box. I appears I am not empting or finalizing something when I leave the names the same on the second box I get the data but also a LOT of empty spots(best way to describe). Any help on this code would be appreciated.
Thanks
Code:

Private Sub frmWorkOrder_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        frmWorkOrderListing.Close()
        HoldScreenError = False

        'Work Requested By Combo Box
        Dim cn As New OleDbConnection("provider=microsoft.jet.oledb.4.0;data source=..\Hy-Tech Maint2.mdb")
        Dim da As New OleDbDataAdapter()
        Dim dt As New DataTable()
        cn.Open()
        da.SelectCommand = New OleDbCommand("select tblemployees2.EmployeeName From tblEmployees2 Order by tblemployees2.employeeName", cn)
        da.Fill(dt)
        cboWorkReqBy.DataSource = dt
        cboWorkReqBy.DisplayMember = "Employees"
        cboWorkReqBy.ValueMember = "EmployeeName"
        cboWorkReqBy.Text = "(Select the Employee)"

        cn.Close()

        ' Machine Number ComboBox
        Dim da2 As New OleDbDataAdapter()
        Dim dt2 As New DataTable()
        cn.Open()
        da2.SelectCommand = New OleDbCommand("select tblmachine.machinenumber From tblmachine Order by tblmachine.MachineNumber", cn)
        da2.Fill(dt2)
        cboMachineNumber.DataSource = dt2
        cboMachineNumber.DisplayMember = "Machine"
        cboMachineNumber.ValueMember = "MachineNumber"
        cboMachineNumber.Text = "(Select the Machine #)"

        cn.Close()
    End Sub


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