CSL_Test__1.MainWindow.DeleteButton_Click C# (CSharp) Method

        private void DeleteButton_Click(object sender, EventArgs e)
        {
            dgvh.RunWorkerCompleted -= new RunWorkerCompletedEventHandler(data_RunWorkerCompleted);
            dgvh.RunWorkerCompleted += new RunWorkerCompletedEventHandler(data_DeleteWorkerCompleted);
            dgvh.RunWorkerAsync("Delete");

            dataGridViewProgressBar.Visible = true;
                /*
                if (dr.Count > 0)
                {
                    foreach (DataGridViewRow r in dr)
                    {
                        dataGridView.Rows.Remove(r);
                    }

                    dgvh.Save();
                }
                else if (dc.Count > 0)
                {
                    foreach (DataGridViewCell c in dc)
                    {
                        if (!(c.ReadOnly))
                        {
                            c.Value = "";
                        }
                    }

                    dgvh.Save();
                }

                dataGridView.Update();
                dgvh.Save();*/
        }