How to populate data to combobox of a datagrid from database

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VB

Hello Guys,
Can anyone help me..cause i don't know how to populate data from the database to datagrid combobox.

Here' my code:

<br />
  Dim strSELECT As String = "SELECT * FROM tblmembership"<br />
        Dim DReader As New DataClassReader<br />
        DReader.strSELECTSQL = strSELECT<br />
        DReader.ReadData()<br />
        dtg1.Rows.Clear()<br />
        Dim i As Integer = 0<br />
        Do While DReader.PinoyLDataReader.Read<br />
            With dtg1<br />
                .Rows.Add()<br />
                .Item(0, i).Value = DReader.PinoyLDataReader.Item("PK")         'TextBox<br />
                .Item(1, i).Value = DReader.PinoyLDataReader.Item("member_id")  'TextBox<br />
                .Item(2, i).Value = DReader.PinoyLDataReader.Item("bobs_id")    'TextBox<br />
                .Item(3, i).Value = DReader.PinoyLDataReader.Item("full_name")  'TextBox<br />
                .Item(4, i).Value = DReader.PinoyLDataReader.Item("mem_type")   'ComboBox<br />
            End With<br />
            i = i + 1<br />
        Loop<br />
        DReader.PinoyLDataReader.Close()

please help....