我需要从生成的动态控件中点击按钮获得价值

Question

有很多控件生成我想在按钮点击上保存值，这是在页面上动态生成的，任何人都可以帮助我。我是这个领域的新手，所以我从代码中使用了很多类型的代码，但它不能......

 protected void Page_Load(object sender, EventArgs e)
       {
        if (!IsPostBack)
        {
            if (Request.QueryString["ID"] != null)
            {

              CreateDynamicForm(Convert.ToInt32(Request.QueryString["ID"]));
            }
        }
    }

    protected void CreateDynamicForm(int id)
    {
        DataTable dt = objDl.FetchList(id);
        if (dt.Rows.Count > 0)
        {
            for (int i = 0; i < dt.Rows.Count; i++)
            {

                string text = Convert.ToString(dt.Rows[i]["ControlToDisplay"]);
                string chkval = Convert.ToString(dt.Rows[i]["IsActive"]);
                if (text == "Checkbox")
                {
                    CheckBox chk = new CheckBox();
                    chk.ID = "Checkbox" + i;
                    string ID = chk.ID;

                    chk.Attributes["style"] = "margin-left: 87px;line-height: 3;";
                    if (chkval == "True")
                    {
                        chk.Checked = true;
                    }
                    else
                    {
                        chk.Checked = false;
                    }

                    Label lbl = new Label();
                    lbl.Text = Convert.ToString(dt.Rows[i]["FieldLabel"]);

                    panelDynamic.Controls.Add(lbl);
                    panelDynamic.Controls.Add(chk);
                    Literal lt = new Literal();
                    lt.Text = "<br />";
                    panelDynamic.Controls.Add(lt);  

                    hdnID.Value = hdnID + "," + ID;
                    HdnType.Value = HdnType + "," + "Checkbox";
                }

                if (text == "Dropdownlist")
                {
                    int j = 0;
                    DropDownList ddlList = new DropDownList();
                    ddlList.ID = "DdlDisplay" + i;
                    ddlList.CssClass = "form-group";
                   // ddlList.CssClass = "col-sm-3";
                    ddlList.Attributes["style"] = "margin-left: 96px;width: 151px;padding-left: 43px;";
                    string texts = Convert.ToString(dt.Rows[i]["OptionValue"]);
                    string[] txtcount = texts.Split(',');
                    foreach (var items in txtcount)
                    {

                        if (items.TrimStart().TrimEnd() != "")
                        {
                            j++;
                            ListItem ltm = new ListItem();
                            //ltm.Attributes["style"] = "padding-left: 43px;";
                            ltm.Value = "Listitem" + j;
                            ltm.Text = Convert.ToString(items);

                            //ddlList.Items.Add(txt);
                            ddlList.Items.Add(new ListItem(ltm.Text, ltm.Value));

                        }
                    }

                    hdnID.Value = hdnID + "," + ddlList.ID;
                    HdnType.Value = HdnType + "," + "Dropdownlist";



                    Label lbl = new Label();
                    lbl.Text = Convert.ToString(dt.Rows[i]["FieldLabel"]);
                    panelDynamic.Controls.Add(lbl);

                    panelDynamic.Controls.Add(ddlList);

                    Literal lt = new Literal();
                    lt.Text = "<br />";
                    panelDynamic.Controls.Add(lt);
                }

                if (text == "SingleLineTextBox")
                {

                    TextBox textb = new TextBox();
                    textb.ID = "TextBox" + i;
                    textb.Attributes["style"] = "margin-left: 87px;";
                    textb.Attributes["required"] = "true";


                    Label lbl = new Label();
                    lbl.Text = Convert.ToString(dt.Rows[i]["FieldLabel"]);
                    panelDynamic.Controls.Add(lbl);

                    panelDynamic.Controls.Add(textb);

                    Literal lt = new Literal();
                    lt.Text = "<br />";
                    panelDynamic.Controls.Add(lt);

                    hdnID.Value = hdnID + "," + textb.ID;
                    HdnType.Value = HdnType + "," + "SingleLineTextBox";
                }

                if (text == "Multiline Textbox")
                {

                    TextBox textMulti = new TextBox();
                    textMulti.ID = "MultiTextBox" + i;
                    textMulti.TextMode = TextBoxMode.MultiLine;
                    textMulti.Attributes["style"] = "margin-left: 87px;margin-top: 16px;";
                    textMulti.Attributes["required"] = "true";

                    Label lbl = new Label();
                    lbl.Text = Convert.ToString(dt.Rows[i]["FieldLabel"]);
                    panelDynamic.Controls.Add(lbl);

                    panelDynamic.Controls.Add(textMulti);

                    Literal lt = new Literal();
                    lt.Text = "<br />";
                    panelDynamic.Controls.Add(lt);

                    hdnID.Value = hdnID + "," + textMulti.ID;
                    HdnType.Value = HdnType + "," + "Multiline Textbox";

                }

                if (text == "RadioButton")
                {
                    RadioButton rdb = new RadioButton();
                    rdb.ID = "rdb" + i;
                    rdb.Attributes["style"] = "margin-left: 87px;line-height: 4";

                    Label lbl = new Label();
                    lbl.Text = Convert.ToString(dt.Rows[i]["FieldLabel"]);
                    panelDynamic.Controls.Add(lbl);

                    panelDynamic.Controls.Add(rdb);

                    Literal lt = new Literal();
                    lt.Text = "<br />";
                    panelDynamic.Controls.Add(lt);

                    hdnID.Value = hdnID + "," + rdb.ID;
                    HdnType.Value = HdnType + "," + "RadioButton";
                }

            }
        }
    }

    protected void btn_submit_Click(object sender, EventArgs e)
    {

    }