private void button2_Click(object sender, EventArgs e)
        {
            string          str = comboBox2.SelectedValue.ToString();
            ReportContainer pc  = new ReportContainer(str);

            pc.ShowDialog();
        }
        private void button3_Click(object sender, EventArgs e)
        {
            ReportContainer pc = new ReportContainer();

            pc.ShowDialog();
        }