Reflection on parent window on the basis of pop up window

Hi,
I am working in asp.net
I have a page called accopunt.aspx which includes a dropdown control which contain designation and it binded to the database.
If the required designation is not available on dropdown the user can click on icon called add new designation. after he click a new pop up window appears name designa0tion.aspx and user can save new designation and click on close
After the user click on close, i need is the new designation that is added should be visible to account.aspx page on dropdown control.

In designation.aspx page on close i am inserting the following code to the sorce code:
 <a href="accounts.aspx" onclick="window.close();">close</a>

and on accounts.aspx

page_load
conn = New SqlConnection(CONN_OBJ.STR_CONN)
        conn.Open()

           
            enable_controls(False) : clear_all()

            '--Code To Bind Designation
            drpdesignation.Items.Clear()
            STR_QUERY = "SELECT [desig_id], [designation] FROM [tbl_designation]"
            myadapter = New SqlDataAdapter(STR_QUERY, conn)
            myds = New DataSet
            myadapter.Fill(myds)
            With drpdesignation
                .DataTextField = myds.Tables(0).Columns(1).ToString
                .DataValueField = myds.Tables(0).Columns(0).ToString
                .DataSource = myds
                .DataBind()
            End With

            ImageButton2.Attributes.Add("onClick", "javascript:var win = window.open('designation.aspx?parameter','mywindow','menubar=1,width=480,height=120,toolbar=no,menubar=no,location=no');return false;")
end sub

Even i have tried included
if not page.ispostback    but even this does not work

Kindly suggest
Thank you
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