ListBoX update

[shotta]

I have two list boxes where a user can make a selection click a add button within a wizard control and it add it to another listbox in the same wizard. My problem is the add goes fine the second listbox is updatedwith the new value. The problem is the listbox where the selection was made still contains the value that was just put in th first listbox. Both listbox gets the data from the db so the next time the program runs both boxes are updated and there are no duplicate values. Is there a way Update both listboxes from the db when the add button is clicked.(remember im using wizard control with listboxes)
I hope I explained this clearly.
heres the code for the add button control

for (count = 0; count < PracticeListBox.Items.Count; count++)
        {
            if (PracticeListBox.Items[count].Selected == true) 
                {
                    //moves item from one practice listbox to the next
                    AgencyPracticeListBox.Items.Add(PracticeListBox.Items[count].ToString());
                    PracticeListBox.Items.Remove(PracticeListBox.Items[count].ToString());
                    SqlCommand cmd = new SqlCommand(AddPracticeQuery , con); 
                    cmd.Parameters.Add(new SqlParameter("@Sponsor_ID", SqlDbType.Int));
                    cmd.Parameters["@Sponsor_ID"].Value = Sponsor_ID;
                    cmd.Parameters.Add(new SqlParameter("@Practice_ID", SqlDbType.Int));
                    cmd.Parameters["@Practice_ID"].Value = PracticeListBox.Items[count].Value;
                    con.Open();
 
                try
                    {
                        cmd.ExecuteNonQuery();
                    }
                catch (SqlException err)
                    {
                      Response.Write(err.Message.ToString());
                    }
                con.Close();
                ///
                ///MUST BE  REFRESH CONTROL INFO
                ///                
                //ViewState.Add("Wizpage",WizPage);
                //Server.Transfer("ModifySponsor.aspx"); (tried calling the page but then it would only end up on the beginning of the wiz step)