Dynamic creation of Table and dropdown list

public void CreateTable()
        {
            tbl = new Table();
            tbl.BorderColor = System.Drawing.Color.Black;
            PlaceHolder1.Controls.Add(tbl);
            
                TableRow tr = new TableRow();
                tr.BackColor = System.Drawing.Color.Orange;
                tr.ID = "row0";
                TableCell tc1 = new TableCell();
                TableCell tc2 = new TableCell();
                //creating lable
                System.Web.UI.WebControls.Label lable1 = new System.Web.UI.WebControls.Label();
                System.Web.UI.WebControls.Label lable2 = new System.Web.UI.WebControls.Label();
                lable1.Text = "Questions";
                lable1.BackColor = System.Drawing.Color.Orange;
                lable2.Text = "Answers";
                lable2.BackColor = System.Drawing.Color.Orange;
                // Add the control to the TableCell
                tc1.Controls.Add(lable1);
                tc2.Controls.Add(lable2);
                // Add the TableCell to the TableRow
                tr.Cells.Add(tc1);
                tr.Cells.Add(tc2);
                // Add the TableRow to the Table
                tbl.Rows.Add(tr);
            
        }

        public void AddRow(string s1,string[] s2)
        {
            TableRow tr = new TableRow();
            tr.ID = "row" + Rows.ToString();
            TableCell tc1 = new TableCell();
            tc1.ID = "tc1" + Rows.ToString();
            TableCell tc2 = new TableCell();
            tc2.ID = "tc2" + Rows.ToString();
            //creating dropdown list
            DropDownList ddl = new DropDownList();
            ddl.ID = "list" + Rows.ToString();
            ddl.Items.Add("Select Answer");
            for (int i = 0; i < s2.Length; i++)
            {
                ddl.Items.Add(s2[i]);
            }
            ddl.SelectedIndexChanged += new EventHandler(dl_SelectedIndexChanged);
            ddl.AutoPostBack = true;
            ddl.EnableViewState = true;
            //creating lable
            System.Web.UI.WebControls.Label lable1 = new System.Web.UI.WebControls.Label();
            lable1.Text = s1;
            lable1.ID = "lable" + Rows.ToString();
            // Add the control to the TableCell
            tc1.Controls.Add(lable1);
            tc2.Controls.Add(ddl);
            // Add the TableCell to the TableRow
            tr.Cells.Add(tc1);
            tr.Cells.Add(tc2);
            // Add the TableRow to the Table
            tbl.Rows.Add(tr);
        }

        protected void dl_SelectedIndexChanged(object sender, EventArgs e)
        {
            DropDownList ddl9 = (DropDownList)sender;
            
            int quesid = 0;
            string questxt = "";
            int ansid = 0;
            string anstxt = ddl9.SelectedItem.Text;
            DataRow[] dr = dt4.Select("anstxt='" + anstxt + "'");
            foreach (DataRow row in dr)
            {
                quesid = Convert.ToInt32(row["quesid"]);
                ansid = Convert.ToInt32(row["ansid"]);
                questxt = row["questxt"].ToString();
                //questxt=row[
            }
            dt3.Rows.Add(quesid, questxt, ansid, anstxt);
            foreach (DataRow row in dt2.Rows)
                if (Convert.ToInt32(row["quesid"]) == quesid)
                    row["son"] = "s";
            //ListBox1.Items.Add("Ans: " + anstxt);
            //TextBox1.Text = "";
            //DropDownList1.Items.Clear();
            foreach (DataRow row in dt1.Rows)
            {
                if (Convert.ToInt32(row["ansid"]) == ansid)
                {
                    row["status"] = 1;
                    //MessageBox.Show("row status changed to" + row["status"].ToString());
                }
            }

            ViewState["CECdt1"] = dt1;
            ViewState["CECdt3"] = dt3;
            int i = GetQuestion(dt1, dt2);
            GetAnswers(i);
            ViewState["CECtbl"] = PlaceHolder1;
            
        }