private void button1_Click(object sender, EventArgs e)
        {
            var comboBoxes     = this.Controls.OfType <ComboBox>().Where(x => x.Name.StartsWith("comboBox")).Reverse();
            var numericUpDowns = this.Controls.OfType <NumericUpDown>().Where(x => x.Name.StartsWith("numericUpDown")).Reverse();
            int maxID          = sql.MaxIDCompound() + 1;
            int index          = 0;

            foreach (var cmbBox in comboBoxes)
            {
                if (cmbBox.Text != NotSelected)
                {
                    Element selected = elements.Find(u => u.name == cmbBox.Text);
                    sql.AddElementToCompound(maxID, selected.id, (int)numericUpDowns.ElementAt(index).Value);
                }
                index++;
            }
            MessageBox.Show("Eklendi!");
        }