private void button_zmenit_vel_tridy_Click(object sender, EventArgs e)
        {
            if (this.dataGridView1.SelectedRows.Count == 0)
            {
                MessageBox.Show("Nejprve vyber řádek");
                return;
            }

            int index = this.dataGridView1.SelectedRows[0].Index;
            // Create a new instance of the Form2 class
            Form_Predmet1 Form = new Form_Predmet1(this);



            // Show the settings form
            Form.Show();

            Form.Init(
                (int)this.dataGridView1.SelectedRows[0].Cells[0].Value,
                this.dataGridView1.SelectedRows[0].Cells[1].Value.ToString(),
                this.dataGridView1.SelectedRows[0].Cells[2].Value.ToString(),
                this.dataGridView1.SelectedRows[0].Cells[3].Value.ToString(),
                this.dataGridView1.SelectedRows[0].Cells[4].Value.ToString(),
                this.dataGridView1.SelectedRows[0].Cells[5].Value.ToString(),
                this.dataGridView1.SelectedRows[0].Cells[6].Value.ToString(),
                this.dataGridView1.SelectedRows[0].Cells[7].Value.ToString(),
                this.dataGridView1.SelectedRows[0].Cells[8].Value.ToString(),
                this.dataGridView1.SelectedRows[0].Cells[9].Value.ToString(),
                this.dataGridView1.SelectedRows[0].Cells[10].Value.ToString()
                );
        }
        private void button1_Click(object sender, EventArgs e)
        {
            // Create a new instance of the Form2 class
            Form_Predmet1 settingsForm = new Form_Predmet1(this);

            // Show the settings form
            settingsForm.Show();
        }