Getting values from dynamically created controls

protected void Page_Load(object sender, EventArgs e)
        {
            string DesignFilePath = Request.QueryString["ReportName"].ToString();
            ReportFields dsReportFieldList = new ReportFields();
            dsReportFieldList.ReadXml(DesignFilePath);

            int TotalRows = 0;
            int TotalColumn = 0;
            foreach(ReportFields.tbl_ReportFieldsRow  rf in dsReportFieldList.tbl_ReportFields)
            {
                TotalRows = Convert.ToInt32(rf.TotalRow) ;
                TotalColumn = Convert.ToInt32(rf.TotalColm);
                break;
            }

            Table ds = new Table();
            ds.ID="table1";
            ds.ViewStateMode = System.Web.UI.ViewStateMode.Enabled;
            ds.BorderStyle = BorderStyle.Solid;
            ds.BorderWidth = 1;
            ds.BorderColor = System.Drawing.ColorTranslator.FromHtml("#003366");
            ds.Width = 500;
            for (int idx = 0; idx < TotalRows; idx++)
            {
                TableRow tr = new TableRow();
                for (int idx1 = 0; idx1 < TotalColumn; idx1++)
                {
                    TableCell tc = new TableCell();
                    tc.Text = idx.ToString() + "," + idx1.ToString();
                    tr.Cells.Add(tc);
                }
                ds.Rows.Add(tr);
            }

            foreach (ReportFields.tbl_ReportFieldsRow rf in dsReportFieldList.tbl_ReportFields)
            {
                string[] Poss = rf.CellPosition.ToString().Split(',');
                ds.Rows[Convert.ToInt32(Poss[0])].Cells[Convert.ToInt32(Poss[1])].Controls.Add(CreateControlString(rf.sID,rf.sSize,"lable",rf.sCaption));
                ds.Rows[Convert.ToInt32(Poss[0])].Cells[Convert.ToInt32(Poss[1])].Controls.Add(CreateControlString(rf.sID, rf.sSize, rf.sControlType,""));
            }

            //FindControl("ContentPlaceHolder1").Controls.Add(ds);
            ContentPlaceHolder ch = new ContentPlaceHolder();
            ch = (ContentPlaceHolder)Page.Master.FindControl("ContentPlaceHolder1");
           
            ch.Controls.Add(ds);

            

            //ViewState.Add("stTable", ds);

        }