谁能解释下这段代码？

//从数据库中选择多选题
            case 2:
                SqlDataAdapter myadapter2 = new SqlDataAdapter("select * "
                    + "from tb_Questions where que_type='多选题'and que_lessonid='"
                    + dd1 + "'and que_taotiid='" + dd2 + "'order by id desc", con);
                DataSet myds2 = new DataSet();
                myadapter2.Fill(myds2);
                DataList2.DataSource = myds2;
                DataList2.DataBind();
                //生成多选题题号
                for (int tID2 = 1; tID2 <= DataList2.Items.Count; tID2++)
                {
                    Label lblDSelect = (Label)DataList2.Items[tID2 - 1].FindControl("Label24");
                    lblDSelect.Text = tID2.ToString() + "、";
                }
                break;
            //核对单选题答案
            case 3:
                SqlDataAdapter myadapter3 = new SqlDataAdapter("select id,que_answer"
                    + " from tb_Questions where que_type='单选题'and que_lessonid="
                    + dd1 + " and que_taotiid=" + dd2 + " order by id desc", con);
                DataSet myds3 = new DataSet();
                myadapter3.Fill(myds3);
                DataRow[] row1 = myds3.Tables[0].Select();
                //计算单选题成绩
                foreach (DataRow answer1 in row1)
                {
                    int_row1 += 1;
                    if (int_row1<= 3)
                    {
                        RadioButtonList rbl = (RadioButtonList)(DataList1.Items[int_row1 - 1].FindControl("RadioButtonList1"));
                        if (rbl.SelectedValue == "")
                        {
                            this.lblSel.Text = "0";
                        }
                        else
                        {
                            if (answer1["que_answer"].ToString().Trim() == rbl.SelectedValue.ToString().Trim())
                            {
                                int_row1Point += 40 / DataList1.Items.Count;
                                this.lblSel.Text = int_row1Point.ToString();
                            }
                        }
                    }
                }
                break;
要很具体很纤细的那种 --------------------编程问答-------------------- 小伙 是不是要答辩了！ --------------------编程问答-------------------- 你怎么知道，求救

补充：.NET技术 ,  C#