Autocomplete textbox with backgroundworker C#

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {      
            try
            {
                con.Open();
                cmd = new MySqlCommand(@"SELECT CONCAT(fname,' ',lname,' ',oname) as name, phoneno FROM dbchurch.member WHERE status = 1;", con);
                reader = cmd.ExecuteReader();
                AutoCompleteStringCollection list_of_member = new AutoCompleteStringCollection();
                while (reader.Read())
                {
                    list_of_member.Add(string.Format("{0}", reader["name"]));
                    list_of_member.Add(string.Format("{0}", reader["phoneno"]));
                }
                backgroundWorker1.ReportProgress(0, list_of_member);
                reader.Close();
                con.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(string.Format("An error occurred {0}", ex.Message), "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            finally
            {
                reader.Dispose();
                con.Dispose();
            }
        }

private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            AutoCompleteStringCollection list_of_member = (AutoCompleteStringCollection)e.UserState;
            txtsearch.AutoCompleteCustomSource.AddRange(e.UserState);
        }