two DDL -follow the leader

Hi,

Two drop down list,

ddloperatorid-contains id
ddloperatorname-contains name

How can we change the ddl selected value to the correct name or id on the other dll? (follow the leader)

i.e.
001 abc
002 efg

ddloperatorid-selected value is 002
then
ddloperatorname- should move to efg (viseversa)

Thanks.

                  Private Function GenerateSourceOper() As DataTable
                      Dim con As New SqlConnection("......")
                      Dim cmd As SqlCommand = con.CreateCommand()
                      cmd.CommandType = CommandType.StoredProcedure
                      cmd.CommandText = "SP_operator_id_and_name"
                      cmd.Parameters.Add(New SqlParameter("@RETURN_VALUE", SqlDbType.Int, 4, ParameterDirection.ReturnValue, False, CType(0, Byte), CType(0, Byte), "", DataRowVersion.Current, Nothing))
                      Dim da As New SqlDataAdapter(cmd)
                      Dim ds As New DataSet()
                      da.Fill(ds,"DataSetName")
                      Return ds.Tables("DataSetName")
                      cmd.dispose
                      cmd.parameters.clear
                      con.close
                  End function

                   Sub Page_Load(Sender As Object, E As EventArgs)
                     If Not Page.IsPostBack Then

                      ddloperatorid.Datasource=GenerateSourceOper().DefaultView
                      ddloperatorid.DataTextField = "supervisor id"
                      ddloperatorid.DataValueField = "supervisor name"

                      ddloperatorname.Datasource=GenerateSourceOper().DefaultView
                      ddloperatorname.DataTextField = "supervisor name"
                      ddloperatorname.DataValueField = "supervisor id"

                      Page.DataBind()
                      ddloperatorid.Items.Insert(0, "Select id")
                      ddloperatorname.Items.Insert(0, "Select name")
                      end if
                  End Sub