Dim odc As OleDbConnection

    Private Sub Form6_Load(sender As Object,e As EventArgs) Handles MyBase.Load
        odc = New OleDbConnection()
        odc.ConnectionString = "Provider = Microsoft.ACE.OLEDB.12.0;data source=Northwind.mdb;"

        Dim odcommand As New OleDbCommand()
        odcommand.CommandText = "select 雇员ID,(姓氏+名字) as 姓名 from 雇员"
        odcommand.Connection = odc
        odc.Open()

        Dim odReader As OleDbDataReader
        odReader = odcommand.ExecuteReader(CommandBehavior.SingleResult)
        If odReader.HasRows Then
            Do While odReader.Read
                cbEmployee.Items.Add(odReader("姓名"))
            Loop
        End If
        cbEmployee.SelectedIndex = 0
    End Sub

    Private Sub cbEmployee_SelectedIndexChanged(sender As Object,e As EventArgs) Handles cbEmployee.SelectedIndexChanged
        Dim id As Integer = cbEmployee.SelectedIndex + 1
        Dim odcommand As New OleDbCommand()
        odcommand.CommandText = "select * from 雇员 where 雇员ID=" & id
        odcommand.Connection = odc

        Dim odReader As OleDbDataReader
        odReader = odcommand.ExecuteReader(CommandBehavior.SingleResult Or CommandBehavior.SingleRow)
        If odReader.HasRows Then
            odReader.Read()
            txtDuties.Text = odReader("职务")
            txtAppellation.Text = odReader("尊称")
            dtpBirthday.Value = odReader("出生日期")
            dtpEmployDay.Value = odReader("雇用日期")
            txtCountry.Text = odReader("国家")
            txtCity.Text = odReader("城市")
            txtArea.Text = odReader("地区")
            txtAddress.Text = odReader("地址")
            txtZipcode.Text = odReader("邮政编码")
            txtPhone.Text = odReader("家庭电话")
        Else
                MessageBox.Show("错误的编号")
        End If
    End Sub