Dynamic Controls bind in aspx page

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C#

ASP.NET

Dear Sir/Madam,

User can create runtime database column whenever navigate that page Dynamically control created.

But my problem was cann't find the values
textbox, dropdownlist values


can you give me inputs....

 <asp:Label ID="lblError" runat="server"></asp:Label>
       <asp:PlaceHolder ID="DynamicControlsHolder" runat="server"></asp:PlaceHolder>
       <asp:Button ID="btnSave" runat="server" Text="Save" OnClick="btnSave_Click" />



string strTableValues = string.Empty;
           string strTableParameter = string.Empty;
           foreach (Controller ctrl in objListControl)
           {
               Response.Write(ctrl.ControlName);
               strTableParameter += ctrl.ColumnName + ",";

               switch (ctrl.ControlName)
               {
                   case "TextBox":
                       TextBox txtInstance = (TextBox)Page.Controls[4].FindControl(ctrl.ControlID);

                       string message = "";




                       // strTableValues = txtInstance.Text;
                       strTableValues += ctrl.ControlID + ",";
                       break;
                   case "DropDownList":
                       strTableValues += ctrl.ColumnName + ",";
                       break;
               }