dynamic creating controls

Hi,
   based on my below code i want to create multiple controls, i tryed for that but iam not getting, i want to create in asp.net
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Collections.Generic;

public partial class Default2 : System.Web.UI.Page
{

     Button[] btn_arr = new Button[20];
    int btn_count;
  protected void Page_Load(object sender, EventArgs e)
 {
 }
  protected void add_button(Button button)
 {
  try
  {
      TableRow tr = new TableRow();
      TableCell tc = new TableCell();
   tc.Controls.Add(bu ...