2 exception in use OleDbDataReader on backgroundworker

private void button1_Click(object sender, EventArgs e)
    {
        try
        {
            OleDbCom = new OleDbCommand("SELECT COUNT(VOSO_Id) FROM " + FrVosolSoratjalase.Vosol_table_2, Program._Connect);
            MaxCountRowsExist = Classes.AbstractLayer.ReturnCountValue(OleDbCom);
        }
        catch (Exception ex) { MessageBox.Show(ex.Message); return; }

        if (!backgroundWorker1.IsBusy)
        {
            progressBar1.Visible = true;
            textBox1.Enabled = button1.Enabled = button3.Enabled = false;
            progressBar1.Value = 0;
            backgroundWorker1.RunWorkerAsync();
            button2.Enabled = true;
        }
    }

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
    {
        NewDatatable("ResultSearch");
        BackgroundWorker worker = sender as BackgroundWorker;
        #region Method 2
        int i = 0;

        if (worker.CancellationPending)
        {
            e.Cancel = true;
            return;
        }
        else
        {
            try
            {
                OleDbComSearching = new OleDbCommand("SELECT * FROM " + FrVosolSoratjalase.Vosol_table_1 + " INNER JOIN " + FrVosolSoratjalase.Vosol_table_2 + " ON " + FrVosolSoratjalase.Vosol_table_1 + ".VOSO_Id = " + FrVosolSoratjalase.Vosol_table_2 + ".VOSO_Id;", Program._Connect);
                OleDbComSearching.Connection.Open();
                OleDbDataRead = OleDbComSearching.ExecuteReader();
                while (OleDbDataRead.Read())
                {
                    if (textBox1.Text.Trim() == OleDbDataRead[6].ToString() | textBox1.Text.Trim() == OleDbDataRead[7].ToString())
                    {
                        DataRow dtrow = FrVosolSoratjalase.DataSetVosol.Tables["ResultSearch"].NewRow();
                        dtrow[0] = OleDbDataRead[0].ToString();
                        dtrow[1] = OleDbDataRead[1].ToString();
                        dtrow[2] = OleDbDataRead[2].ToString();
                        dtrow[3] = OleDbDataRead[3].ToString();
                        dtrow[4] = OleDbDataRead[4].ToString();
                        dtrow[5] = OleDbDataRead[5].ToString();
                        dtrow[6] = OleDbDataRead[6].ToString();
                        dtrow[7] = OleDbDataRead[7].ToString();
                        dtrow[8] = OleDbDataRead[8].ToString();
                        dtrow[9] = OleDbDataRead[9].ToString();
                        dtrow[10] = OleDbDataRead[10].ToString();
                        dtrow[11] = OleDbDataRead[11].ToString();
                        dtrow[12] = OleDbDataRead[12].ToString();
                        dtrow[13] = OleDbDataRead[13].ToString();
                        FrVosolSoratjalase.DataSetVosol.Tables["ResultSearch"].Rows.Add(dtrow);
                    }
                    i++;
                    worker.ReportProgress((int)((double)i / MaxCountRowsExist * 100));
                }
            }
            catch (InvalidOperationException) { MessageBox.Show("InvalidOperationException"); }
            catch (NullReferenceException) { MessageBox.Show("NullReferenceException"); }
            finally
            {
                OleDbDataRead.Close();
                OleDbCom.Connection.Close();
            }
        }

private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
        progressBar1.Value = e.ProgressPercentage;
    }

private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
        if (e.Error != null)
        {
            progressBar1.Visible = false;
            textBox2.Text = "";
            textBox1.Enabled = button1.Enabled = button3.Enabled = true;
            button2.Enabled = false;
            MessageBox.Show(e.Error.Message);
        }
        else if (e.Cancelled)
        {
            dataGridView1.DataSource = FrVosolSoratjalase.DataSetVosol.Tables["ResultSearch"];
            textBox2.Text = dataGridView1.RowCount.ToString();
            textBox2.Text = "";
        }
        else
        {
            dataGridView1.DataSource = FrVosolSoratjalase.DataSetVosol.Tables["ResultSearch"];
            textBox2.Text = dataGridView1.RowCount.ToString();
            progressBar1.Visible = false;
            textBox1.Enabled = button1.Enabled = button3.Enabled = true;
            button2.Enabled = false;
        }
    }

if (textBox1.Text.Trim() == OleDbDataRead[6].ToString() | textBox1.Text.Trim() == OleDbDataRead[7].ToString())

while (OleDbDataRead.Read())