Thread t = new Thread(delegate(){

                MDataTable dataTable = DBHelper.getAllServer();
                foreach (MDataRow row in dataTable.Rows)
                {
                    addDataGridViewRow(dataGridView, row);
                }

            });
            t.Start();

private void btnAllLK3125_Click(object sender, EventArgs e)
        {
            btnAllLK3125.Enabled = false;

            string strLog = string.Empty;
            Thread t = new Thread(delegate()
            {
        // TODO

                this.BeginInvoke((ThreadStart)delegate()
                {
                    btnAllLK3125.Enabled = true;
                });

            });
            t.Start();
        }