控制组合框中的组合框

Question

我在8个groupbox中有56个组合框.Groupboxes的名字是groupBox1，groupBox2依此类推.Checboxes的名字是comboBox_51，comboBox_52..comboBox_530，comboBox_71 ... comboBox_725等等。我想控制起始名comboBox_5和comboBox_7和获取有关selectedIndex的信息，这是我失败的代码。

foreach (var groupbox_ in this.Controls.OfType<GroupBox>().Where(x => Name.StartsWith("groupBox")))
        {


            foreach (var combobox_ in this.groupbox_.Controls.OfType<ComboBox>().Where(x => Name.StartsWith("comboBox_5")))
            {

                switch (combobox_.SelectedIndex)
                {
                    case 0:
                        toplam += 20F; akts += 5;
                        break;
                    case 1:
                        toplam += 17.5F; akts += 5;
                        break;
                    case 2:
                        toplam += 15F; akts += 5;
                        break;
                    case 3:
                        toplam += 12.5F; akts += 5;
                        break;
                    case 4:
                        toplam += 10F; akts += 5;
                        break;
                    case 5:
                        toplam += 7.5F; akts += 5;
                        break;
                    case 6:
                        toplam += 5F; akts += 5;
                        break;
                    case 7:
                        toplam += 2.5F; akts += 5;
                        break;
                    case 8:
                        toplam += 0F; akts += 5;
                        break;
                    default:
                        toplam += 0F; akts += 0;
                        break;
                }
            }

        }