private void button3_Click(object sender, EventArgs e)
            {
                _range = "A" + (Convert.ToInt32(textBox1.Text) - 1).ToString() + ":J" + textBox2.Text;
                OdbcConnection cn = new OdbcConnection();
                cn.ConnectionString = string.Format(@"Driver={{Microsoft Excel Driver (*.xls)}};DBQ={0};ReadOnly=0;", label1.Text);
                string strCom = "select * from [" + _sheet + "$" + _range + "]";
                cn.Open();
                OdbcCommand comm_mon = new OdbcCommand(strCom, cn);
                OdbcDataAdapter da = new OdbcDataAdapter();
                da.SelectCommand = comm_mon;
                System.Data.DataTable dt = new System.Data.DataTable();
                da.Fill(dt);
                DataSaver ds = new DataSaver(login_, password_);

                ds.SavePaymentsPlan(dt);

            }