invisible datarepeater database update

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threads

hi

i have a datarepeater and a moving label in my c# winform
when i update my repeater the lael stop moving

i've read and i realise that both controls uses the current GUI thread

i created another thread but still hangs the UI
my code

 private void refresh_test_Tick(object sender, EventArgs e)
        {
            Thread t =new Thread(new ThreadStart(set_datasource));
            if (fcon.State == ConnectionState.Open)
            fcon.Close();
            fcon.Open();
            dt.Clear();
            sda.Fill(dt);
            get_printed_tests();

        }
        delegate void _set_datasource();

        private void set_datasource ()
        {
            if (this.testsDataRepeater.InvokeRequired)
            {
                _set_datasource d = new _set_datasource(set_dtsrc);
                this.Invoke(d, dt);
            }
            else
            {
                testsDataRepeater.DataSource = dt;

            }
           
        }
        private void set_dtsrc()
        {
            testsDataRepeater.DataSource = dt;
        }

public void get_printed_tests()
        {
                testsDataRepeater.DataSource = dt;
            if (testsBindingSource.Position<testsbindingsource.count-1)>
                testsBindingSource.MoveNext();
            else
                testsBindingSource.MoveFirst();
            }

of course the datarepeater refreshed accoring to timer interval

another questhion--- is there a way to moke refresh not seen by user ??

thanks alot