private void btnOpenLogClick(object sender, EventArgs e)
        {
            OpenLog o = new OpenLog(this);

            if (o.listBox1.Items.Count != 0)
            {
                o.Show();
            }
            else
            {
                MessageBox.Show("There is log for " + dateTimePicker1.Text);
            }
        }
        private void button2_Click(object sender, EventArgs e)
        {
            OpenLog f = new OpenLog(this);

            f.Show();
        }